Japanese Potato Curry

You might be wondering what a Polish chef has to do with Japanese cuisine. Fair question.
My love for Japanese food, and Japanese curry most of all, led me to one of my favourite comfort dishes: Japanese Potato Curry (Kare Raisu).

It came out of a happy accident. I was out of beef one day and still wanted that mild, comforting curry flavour, so I leaned into simplicity, and the potato version has been a regular on my table ever since.

The recipe below is the one I cook. If you want a slightly different one, I built a Japanese Curry Builder around it: choose your protein, how hot you want it, how thick the sauce should be and how many you are feeding, and it works out the quantities and the method to match. It goes well past this recipe too, into keema and dry curry, and it tells you what to do with the leftovers.

Want it heartier? Lay a crispy breaded cutlet on top and you have katsu curry, with a little of my homemade tonkatsu sauce over the cutlet itself.

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Why is this Japanese Potato Curry so good?

First of all, it’s budget-friendly. The ingredients are simple, affordable, and easy to find, making this dish gentle on the wallet without sacrificing flavour.

The vegetables are the focus here. The default uses beef stock for depth, and one swap makes it fully vegetarian: vegetable stock with a spoonful of miso. Either way the stars are tender potatoes, carrots, and a silky curry sauce that feels both elegant and deeply satisfying.

Most importantly, this curry stays true to the Japanese style: mild, savoury, and comforting rather than fiery. It’s the kind of dish you can enjoy any day of the week, especially when you want something warming and familiar.

What is the History of Curry in Japan?

Food is rarely just food, and Japanese curry is a lovely example of that. Curry began in India, but it reached Japan the long way round, carried through Britain in the 19th century and arriving already softened into a mild, roux-based style.

The Japanese navy took it on because it was filling, cheap and easy to cook in big batches, and from there it spread into home kitchens. Cooks made it their own: the spice was gentled, a little sweetness came in from apple or honey, and potatoes, carrots and onions became standard. What you end up with is the mild, comforting curry in this recipe.

What are the Best Potatoes for Japanese Curry?

Use a waxy potato. Varieties like Charlotte, Yukon Gold or new potatoes hold their shape through a long simmer and take on the sauce instead of falling apart. Floury potatoes such as Maris Piper or Russet break down, cloud the curry and thicken it past the point you want. That is the whole decision, and it comes down to starch.

Best Potatoes for Japanese Curry

When choosing the best potatoes for Japanese curry, waxy or all-purpose varieties are ideal because they maintain their shape and provide a creamy texture. Here are some great options:

• Charlotte - A popular waxy variety in UK with a smooth texture and subtle sweetness, making it an excellent choice for Japanese curry. It holds its shape well while soaking up the curry flavours. These are my favourite!
• Yukon Gold - A great balance between waxy and starchy, making it perfect for Japanese curry. It holds its shape but also absorbs the flavours of the curry well.
• Red Potatoes - These have a firm texture and thin skin, preventing them from breaking down in the sauce.
• New Potatoes - Their waxy nature helps them stay intact while cooking, giving a smooth bite.
• Dutch Cream - A buttery, creamy potato that works beautifully in Japanese curry.
• Kennebec - An all-purpose potato that holds up well but is slightly fluffier than waxy varieties.

Potatoes to Avoid for Japanese Curry

As potatoes mature, they accumulate more starch while losing moisture. Starchy potatoes, like Russet or Maris Piper, break down easily when cooked, making the curry overly thick and grainy. While they can be used, they won’t provide the best texture for Japanese curry.

What protein to serve with Japanese Potato Curry?

I absolutely love preparing this delicious curry for my family. Each time, I like to serve it with a different protein side. Here are some ideas for you:

• Soy Glazed Fried Tofu - Start with firm tofu, sizzle it in a pan until it’s wonderfully browned, and then lavish it with a sweet soy sauce glaze. It’s a bite of pure satisfaction guaranteed!
• Chickpeas - Grab a can of cooked chickpeas and give them a gentle boil for 10 minutes. They’ll become so tender, they’ll practically melt in your mouth!
• Peas or Edamame - A lovely alternative for all the veggie enthusiasts out there.

Japanese Potato Curry as a base for Katsu

Japanese Potato Curry makes a fantastic base for Chicken Katsu, creating a comforting and flavourful dish. The rich, savoury curry pairs perfectly with the crispy, golden breaded chicken, offering a satisfying contrast in texture. Serving the katsu on top allows the crunchy coating to stay crisp while soaking up just enough of the aromatic sauce, making every bite a delicious blend of flavours.

Equipment You’ll Need

Ingredient Substitutions

• Gluten free Swap the plain flour in the roux for rice flour and use about a quarter less of it, since rice flour thickens harder. Worth knowing that Japanese curry powder is normally wheat free on its own. It is the shop-bought roux blocks that carry the flour, which is exactly why making your own solves the problem.
• No coconut cream Double cream or whole milk will do the job, though you lose the faint sweetness. Plain water thins it too far. If you use coconut milk instead of cream, hold back a little of the stock, because milk is thinner and you are about to thicken the pot anyway.
• Vegetarian and vegan Vegetable stock with a tablespoon of miso stirred in, which puts back the savoury weight the beef stock was carrying. Swap the honey for maple syrup or a little more mirin and the whole dish is vegan, since the roux is only oil and flour.
• No mirin A teaspoon of caster sugar dissolved in a tablespoon of rice vinegar gets close. Dry sherry works at a push, but add it earlier so the alcohol cooks off.
• Curry powder Ordinary Madras or a mild curry powder from any supermarket is fine, and plenty of readers outside Japan cannot get a Japanese blend at all. If yours is a hot one, start at half and taste.
• Sweet potatoes for waxy Perfectly good, and they hold together well. Leave the honey out if you use them, because they bring more than enough sweetness of their own.

How to Make Japanese Potato Curry, Step by Step

Full quantities are in the recipe card below. This is the walkthrough, with the reasoning behind each step, so you know what you are looking for rather than just following instructions.

1. Start the base. Two tablespoons of rapeseed oil into a medium pot over a medium heat. Use a pot rather than a shallow pan: half a litre of stock is going in here shortly and you want the depth.
2. Sweat the onions and celery. Three diced onions and half a finely chopped celery stick, eight minutes on medium. Sweat them, do not brown them. You want soft and translucent, because colouring the onions here pushes the whole curry towards a darker, roastier flavour than the mild Japanese style you are aiming for.
3. Add the carrots and potatoes, and let them take some colour. Turn the heat up a little, add the diced carrots and potatoes, and fry until the edges start to brown, adding a splash more oil if the pot looks dry. This is the step people skip and it is worth keeping, because it builds the savoury depth a mild curry needs. On the potatoes: use a waxy variety. Waxy potatoes hold their shape through 25 minutes of simmering, whereas floury ones such as Maris Piper or King Edward break down and leave the sauce cloudy and grainy. Sweet potatoes work too, but they cook faster, so keep an eye on them. Cut the potatoes big, around five centimetres, which is bigger than feels right. Small pieces are what disintegrate over a 25 minute simmer, and the whole point of choosing a waxy variety is wasted if you dice them like a stew.
4. In with the stock, soy and mirin. Five hundred millilitres of beef stock, a tablespoon of dark soy and a tablespoon of mirin. The dark soy is doing more than seasoning: it gives the sauce its colour and a deeper savoury note than standard soy would. To keep it vegetarian: use vegetable stock with a tablespoon of miso stirred in. The miso replaces the savoury weight the meat stock was carrying, and without it the curry tastes noticeably thin. Go carefully with salt at this point. Between the stock and the dark soy there is already a good deal in the pot, so taste at the end rather than seasoning now.
5. Simmer until tender. Bring it to the boil, drop it to a simmer and leave it for 20 to 25 minutes, until a knife goes into the potato with no resistance. Sweet potatoes will get there sooner.
6. Make the roux while that simmers. This is the step that makes the recipe. Shop-bought Japanese curry cubes are convenient, but they are expensive and full of additives, and doing it yourself takes about three minutes: flour, fat and curry powder is genuinely all a roux is. Heat three tablespoons of oil in a small frying pan, add the sliced garlic and cook until it browns, then stir in the curry powder and the plain flour. Keep the heat low and give it a minute so the flour cooks out and loses its raw, pasty taste. You are after a thick, fragrant paste. Making your own means you set the heat level and the salt, and the finished curry tastes cleaner than anything from a box.
7. Coconut cream and honey. When the vegetables are where you want them, stir in 200ml of coconut cream and a teaspoon of honey, bring it back to the boil and turn the heat off. Use coconut cream rather than coconut milk here: milk is too thin and will loosen a sauce you are about to thicken. Skip the honey if you went with sweet potatoes, they bring plenty of their own sweetness.
8. Stir the roux through to thicken. Take the pot off the heat before the roux goes in: roux hitting boiling liquid seizes into starchy lumps, while off the heat it disperses smoothly. Stir it through until it is completely smooth, then put the pot back on a low heat and let it tick over for a good ten minutes, stirring. Off the heat only dissolves the roux. The thickening happens over that gentle simmer, and skipping it is the usual reason a homemade curry comes out thinner than the shop-bought kind. If it is still looser than you like, let it bubble uncovered for a few minutes to reduce, or cook out a little more roux in the pan and stir that in as well. Do not tip dry flour straight into the pot, it will go lumpy. Taste it, adjust the seasoning, and serve over short grain rice with sliced green chilli. It is also better on the second day, because a night in the fridge lets the spice settle into the sauce, so cook it ahead if you can.

Video Recipe for Japanese Potato Curry

Recipe Card for Japanese Potato Curry

Kakushiaji: the Japanese Secret Ingredients

Japanese home cooks have a word for the thing they add that nobody is meant to notice: kakushiaji, the hidden taste. Ask on any Japanese curry forum what goes in and the same three answers come back, and they are more interesting than they sound.

• Instant coffee The most commonly named of the lot. Half a teaspoon of instant stirred in with the roux darkens the sauce and adds a roasted bitterness that stops the sweetness running away with it. It does not taste of coffee. If you want the near black colour of a Kanazawa style curry, coffee plus a splash of red wine is how it is done.
• Grated apple Half an apple on the fine side of a grater, in with the onions. Standard in most Japanese recipes and the reason boxed curry tastes faintly fruity. My card uses a teaspoon of honey instead, which does a similar job more quietly, so treat the apple as an alternative rather than an addition unless you want it noticeably sweeter.
• Dark chocolate Two or three grams, no more, stirred in after the roux has melted. It rounds the edges off the spice rather than making anything taste of chocolate. Easy to overdo, so start smaller than you think.

A word of warning that comes up again and again from people who have tried this: pick one, not all three. The commonest complaint about heavily sweetened curries is a single ingredient taking over, and it is nearly always because someone added a sweetener on top of a sweetener and then did not reduce the sauce enough to bring it back.

Troubleshooting

• If it will not thicken, put it back on a low heat and stir for a good ten minutes. Flour needs heat and time to do its work, and the usual causes are too little roux, too much liquid, watery vegetables, or honey and grated apple added too late, which is explained below. A tablespoon of flour slaked in cold water will rescue it if it is still loose.
• If it tastes flat, the answer is almost always the onions rather than the spice. Sweating them properly, until they are genuinely soft and going golden, is what carries the whole dish. Failing that, my card is deliberately mild at four teaspoons of curry powder, so go up to a tablespoon or more if you want it assertive.
• Too hot for children? Stir a splash of milk and a little honey into their bowl rather than watering down the whole pot. Milk works because the casein in dairy binds to the compounds that make heat register. Oat and other plant milks will not do the same job.

Variations and What to Do with Leftovers

• Curry udon The classic second day dish. Loosen the leftover curry with dashi or stock until it pours, and serve it over thick udon noodles. Better with a slightly thinner sauce than you would want over rice.
• Curry doria Leftover curry spooned over rice in an ovenproof dish, cheese on top, under the grill until it blisters. Not remotely traditional Japanese cooking and completely worth it.
• With a cutlet on top A breaded cutlet turns it into katsu curry, which is the version most people meet first.
• Japanese pickles Fukujinzuke, the sweet red soy pickled daikon and lotus root, and rakkyo, pickled Chinese onions, are what actually turns up beside curry in Japan. A sharp mouthful between spoonfuls does the same job a chutney does with an Indian curry.
• Make the roux ahead The roux keeps on its own, which is worth knowing given it is the only fiddly part. A month in the fridge in a sealed jar, or three to four months in the freezer. Make a double batch while the pan is out.

Storing, Freezing and Reheating

Curry keeps in the fridge for three or four days and genuinely improves for the first two of them. Cool it quickly, in a shallow container rather than the pot it cooked in, and get it covered and cold rather than leaving it to sit out.

Freezing needs one piece of care that most curry recipes will not mention, because most curries are not built on potatoes. Potato frozen in sauce turns spongy and dry once thawed. The cells rupture, the water leaves, and what comes back is grainy in a way no amount of reheating fixes. Every Japanese cookery site that addresses freezing says the same thing.

The fix is simple enough. Lift the potatoes out before the curry goes into the freezer and either eat them within the few days or mash them and freeze them separately, where the texture no longer matters. The sauce itself freezes very well for a month. Boil fresh potatoes when you come to serve it, drop them into the reheated sauce, and nobody will know the difference.

Reheat gently in a pan rather than blasting it. The sauce is flour thickened, so it will thicken further as it stands and may want a splash of water or stock loosening it back to where you had it.

FAQ for Japanese Potato Curry

Which potatoes are best for Japanese curry?

Waxy potatoes. Charlotte, Yukon Gold, red or new potatoes all stay in firm chunks through the simmer and soak up the sauce. Avoid floury varieties such as Maris Piper or Russet: they collapse, make the curry grainy and thicken it too far. If floury is all you have, cut the chunks larger and add them later.

What vegetables go well in Japanese potato curry?

Aside from potatoes, common vegetables in Japanese curry include carrots, onions, bell peppers, mushrooms, peas, and kabocha squash. You can also add spinach or eggplant for extra flavour.

Can I make Japanese potato curry vegetarian or vegan?

Easily, and you are most of the way there already. The roux in this recipe is just oil and flour, so unlike shop-bought curry blocks there is no dairy hiding in it. Two swaps do the rest: use vegetable stock in place of the beef stock, and replace the honey with maple syrup or a pinch of sugar. The vegetables are doing the work in this curry anyway, though tofu, mushrooms or chickpeas are all good if you want more substance.

How long does Japanese curry last in the fridge?

Japanese curry lasts for 3-4 days in the fridge when stored in an airtight container. The flavours develop over time, so leftovers often taste even better!

Can I freeze Japanese potato curry?

You can freeze the curry, but be warned about the potatoes: they come out spongy and a little dry after freezing, because the texture that makes them good here does not survive being frozen and thawed. If you know you are freezing a batch, the neat trick is to leave the potatoes out, freeze the sauce and vegetables, then boil fresh potatoes and stir them in when you reheat. The sauce itself keeps for about three months. The homemade roux is worth making ahead too, and it keeps for around a month in the fridge or three to four months in the freezer, which turns this into a genuinely quick midweek dinner.

What’s the difference between Japanese curry and Indian curry?

Japanese curry is milder, slightly sweet, and has a thicker, stew-like consistency due to the roux. Indian curry uses more spices, has a thinner sauce, and can be much spicier. Japanese curry also tends to be sweeter due to the use of apples or honey.

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Does honey stop Japanese curry thickening?

It can, and this is the one that catches people out. Honey carries enzymes that break down starch, and starch is exactly what is doing your thickening. Stir it in at the end, the way most recipes tell you to, and you can end up with a curry that never comes together no matter how long you simmer it. Raw grated apple does the same thing, and so does any raw fruit or vegetable puree.

The Japanese roux manufacturers are clear about this on their own websites. House Foods say plainly that adding honey can make the curry difficult to thicken, and their instruction is to put it in with the water and simmer for at least twenty minutes. Glico give the same warning for fruit and vegetable purees and explain the mechanism: heat the pot properly before the roux goes in, or the enzymes are still active when the starch arrives.

So in this recipe the honey goes in with the stock and coconut cream, well before the roux, and it gets the full simmer. That is not an accident of the order. Coffee, chocolate, soy and Worcestershire have no enzymes worth worrying about and are fine stirred in at the end.

A Few Words from the Chef

I have to be honest, I did not grow up eating Japanese curry at all. My partner made it for me one evening and I fell in love on the very first spoonful. It is delicate and mild, yet full of flavour and comfort, exactly the sort of food I want on a quiet night in. If you make it, leave a comment and tell me whether it wins you over the way it won me over.

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