We make onion bhaji at work on occasion, and at home for our curry nights, which are some of my favourite meals to cook. They never last long on the table.
They are gram flour, not batter: chickpea flour mixed with the sliced onion and the spices until it clings, so there is nothing to dip anything into. A matchsticked potato goes in with the onion, which is not in every recipe and is what holds a bhaji together when it hits the oil. This makes about twenty.
I serve them with a quick chilli dipping sauce made from red chilli, pepper, garlic and lemon, though mango chutney or a cool mint yoghurt do the job. They are also good beside my Mango Butter Chicken on a curry night.
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Pin itMaking Air Fryer Onion Bhaji: A Healthier Twist
If you’re looking to make onion bhaji in an air fryer, follow the same preparation steps for the onion bhaji mix. Instead of deep frying, place the bhajis in the air fryer and cook at 180°C for 15-20 minutes or until golden brown, turning halfway. Ensure they are spaced out evenly to allow for proper air circulation. This will give your air fryer onion bhaji a crispy finish.
What are Onion Bhajis? Exploring the Popular Indian Snack
Onion bhajis, a celebrated Indian snack, consist of sliced onions, spices, and gram flour, deep-fried to achieve a crispy, golden-brown texture. Commonly served as an starter or snack alongside chutneys or sauces, they enjoy widespread popularity not only across the Indian subcontinent but also globally. The roots of onion bhajis trace back to India, where they have long been a much-loved street food snack. In Hindi, ‘bhaji’ refers to a ‘vegetable fritter,’ and over time, the dish has expanded to include various vegetables, such as potatoes, spinach, and aubergine, alongside onions.
In recent years, onion bhaji recipes have soared in popularity worldwide, particularly in the UK, where the air fryer version is a popular twist. Variations of the dish might incorporate different spices or ingredients like ginger, garlic, or chillies, reflecting local tastes and culinary innovations.
Why This Batter Has No Water in It
Nearly every onion bhaji recipe you will find adds water to the gram flour and tells you to fry straight away. This one does not, and the three ingredients that look unusual on the list are all part of the same decision.
The onions provide the liquid. Salt them along with everything else, leave the bowl for a quarter of an hour after the flour goes in, and they release enough moisture to turn a dry, crumbly mixture into a paste that clings. That is why the resting step is in the recipe and why you should not skip it: it is doing the job the water does elsewhere. It is also why you should not wring the onions out first, which is standard advice on recipes that add water and would leave this one with nothing to bind.
The potato matchsticks are mine. No traditional bhaji has them. They hold their shape in the oil, give the bhaji a frame to build around and turn crisp at the tips, and they are a large part of why these hold together without any added water.
The egg is insurance. Most versions bind with the onion liquid alone. Leave it out if you want them vegan and they still work, but expect to be a little more careful lowering them into the pan.
How to Make Onion Bhaji, Step by Step
- Get the oil up to 170C first. Before anything is mixed, because the batter should not be standing about waiting for the pan once it is ready. Use a thermometer rather than guessing: too cool and the bhajis drink oil and come out heavy, too hot and the outside is dark while the onion inside is still raw and sharp.
- Mix the onions, potato, chilli, garlic and ginger, coriander, salt and spices. All of it together in a big bowl, and mix it properly with your hands so every strand is coated. The salt is doing real work here: it starts pulling liquid out of the onions, and that liquid is what the flour will turn into batter later. There is no water in this recipe and nothing else to bind it with.
- Crack in the egg and work it through. One egg, mixed until you cannot see it any more. Most bhaji recipes have no egg in them at all and bind with water instead. This one uses it as insurance, because a loose bhaji falling apart in hot oil is the commonest way this goes wrong.
- Add the gram flour a bit at a time, then leave it for 10 to 15 minutes. Stir as you go until there is not a dry patch left. It will look too dry at first and that is the point: the rest is what fixes it. In that quarter of an hour the salt keeps drawing liquid out of the onions and the gram flour drinks it up, and what was a dry, crumbly bowl turns into a thick paste that clings. Recipes that add water tell you to fry immediately instead, which is right for them and wrong for this one.
- Shape them loosely, about a tablespoon each. Gloves help. Gather a small amount and lower it into the oil without squeezing it into a ball: a compressed bhaji fries into a dense lump, where a loose one has gaps for the oil to get into and comes out with those shaggy crisp edges that are the whole point. Lower it in and leave it alone for a minute before you touch it.
- Fry until deep golden, turning once, and do not crowd the pan. Four or five at a time in a domestic pot. Every bhaji you add drops the oil temperature, and a pan that has fallen to 150C produces greasy bhajis no matter how good the batter was. Let it come back up between batches. Out with a spider onto kitchen paper.
- Keep going, and serve them hot. They are at their best within a few minutes of coming out. If you are frying twenty, hold the early ones on a rack in a low oven rather than stacked on a plate, where the ones underneath steam and go soft.
- For the dipping sauce, everything into the blender at once. Red chilli, pepper, garlic, lemon, coriander stems and all, cumin, water, sugar, salt and the olive oil. The stems carry more flavour than the leaves do, so they go in rather than in the bin.
- Taste it and adjust before it goes anywhere near a bowl. It wants to be sharper and saltier than seems sensible on a teaspoon, because it is about to be eaten with something deep-fried and that flattens everything. Loosen it with a little more water or lemon if it is too thick to dip into.
- Let it stand for a few minutes. Blending whips air into it and a sauce full of bubbles looks pale and frothy rather than glossy red. A short rest and they rise and go.
- Pour it into the serving dish and put it next to the bhajis. It keeps in the fridge for three or four days, and it is worth making the full amount even for a small batch, because it is good on a great deal more than bhajis.
Recipe Card for Onion Bhajis
Crispy Onion Bhaji with Chilli Dipping Sauce
Onion bhaji made with gram flour and turmeric, fried until crisp, with a fresh red chilli dipping sauce to go alongside.
Equipment I Use
Ingredients
Instructions
Heat your deep fat fryer or a small pot filled with oil to 170°C (340°F). Use an electric probe thermometer to check the oil temperature accurately.
In a large bowl, combine sliced onions, potato matchsticks, green chilli, garlic ginger paste, fresh coriander, salt, and spices. Mix thoroughly to ensure the onions are well coated.
Crack one egg into the bowl and blend it well with the onion mixture, ensuring an even distribution.
Gradually add the chickpea flour, stirring constantly. Mix until there are no dry patches of flour. (Tip: Allow the mixture to rest for 10-15 minutes before frying, to enhance the texture and flavour.)
With gloves on, gently form a small portion of the mixture into a ball (1tbsp), avoiding over-compression. Carefully place it into the hot oil.
Fry each bhaji until golden-brown, flipping halfway for even cooking. Remove from oil with a spider strainer or tongs and drain on kitchen paper.
Continue frying the remaining bhajis. Serve warm, or reheat in the oven if necessary before serving.
Place all the ingredients into your blender. Blend them until you reach a smooth consistency, perfect for a chilli sauce.
Taste the sauce and adjust the seasoning as needed. If it’s too thick, add a bit more water or lemon juice.
Transfer the blended sauce into a bowl. Give it some time to rest, letting any air bubbles rise to the surface and dissipate.
Once the air bubbles have cleared, pour the sauce into your chosen serving dish, ready to be enjoyed.
Chef’s notes
- Onion Thickness: Thinly slice the onions for a delicate texture in the bhajis. Thick slices can make the bhajis bulky and affect even cooking.
- Oil Temperature: Maintaining the oil at the right temperature (170°C/340°F) is crucial. Too hot, and the bhajis will burn on the outside while remaining raw inside; too cool, and they’ll absorb too much oil and become greasy.
- Frying in Batches: Avoid overcrowding the pan when frying. Cook the bhajis in batches to maintain the oil temperature and ensure they cook evenly and get crispy.
- Drain Excess Oil: After frying, place the bhajis on kitchen paper to drain any excess oil. This helps keep them crisp.
- Nutritional Note: As this is a deep-fried dish, be mindful of the oil intake. Using a spider strainer or slotted spoon helps reduce oil absorption when removing the bhajis from the pot.
Nutrition per serving
Pin itBhaji make a great starter alongside a curry - try them with my Mango Butter Chicken (Murg Makhani), Chickpea and Sweet Potato Madras Curry and Chana Dal Recipe.
A Few Words from the Chef
Here in the UK, curry is close to a national obsession, and homemade bhaji are the best you will ever taste. Fry a batch, dip them in the chilli sauce, and you will see exactly what I mean.
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Tips for the Best Onion Bhaji
- Let it rest once the flour is in. Ten to fifteen minutes, which is when the salt draws liquid out of the onions and the gram flour drinks it up. Do not wring the onions out first, however often you read it elsewhere: this batter has no added water, and that liquid is what binds it.
- Trust it when it looks too dry. Straight after the flour goes in there will not seem to be enough moisture to bind anything. Give it the rest before you reach for a spoonful of water, and nine times out of ten you will not need one.
- Have the oil hot before you mix. The rest is deliberate, but much past twenty minutes the onions keep weeping and the batter slackens, so aim to be frying while it is still a thick paste rather than a loose one.
- Test the oil with a drop of batter. Flick a little in and it should sizzle and rise steadily within a few seconds; if it sinks and sits, your oil is too cool and the bhajis will drink it up.
- Re-crisp leftovers with dry heat. A short spell in a hot oven or air fryer brings tired bhajis right back to life far better than a microwave ever will.
Ingredient Substitutions
- Gram (besan) flour - plain flour works in a pinch, but it does not drink the onion liquid the way gram flour does, so expect a slacker mixture and be ready to add another spoonful of flour after the rest.
- Rice flour - stir a spoonful in alongside the gram flour for an extra-shattering, crunchy shell if you like them really crisp.
- The onions - the same batter is brilliant round courgette, cauliflower florets or green beans, so use up whatever veg you have.
- Fresh green chilli - a good pinch of chilli powder or dried flakes gives the same warmth when you have no fresh chilli in.
- Fresh coriander - flat-leaf parsley stands in nicely, or simply leave it out if it is not to your taste.
What to Serve With Onion Bhaji
🍽 I love these piled up as a starter with a cooling mint raita and a spoon of mango chutney alongside the chilli dip, so there is a bit of heat and a bit of calm on the plate. They also earn their place as part of a bigger spread, sitting next to a rich curry and some rice and naan the way you would get them at your favourite Indian restaurant. Serve them hot and fresh, scattered with a little extra coriander, and they will vanish before the mains even arrive.
FAQ for Onion Bhaji
How do I get really crispy bhajis?
Slice the onions thinly, keep the batter on the thicker side (not runny), and fry at a steady medium-hot temperature so they crisp up quickly instead of soaking up oil.
Why are my bhajis greasy or soggy?
Almost always the oil was not hot enough, or the batter was too thick and wet. Keep the oil around 170-180°C (340-355°F) and fry in small batches so the temperature stays up.
What flour is used for onion bhajis?
Gram flour (also called chickpea or besan flour). It is naturally gluten-free and gives bhajis their classic nutty flavour and crisp texture.
Can I bake or air-fry them?
Yes, for a lighter version - brush them with oil and cook until golden. They will be a little less crisp than deep-fried, but still delicious.
What do I serve them with?
The chilli dipping sauce here, or mango chutney and a cooling mint raita. They make a great starter or side with any curry.
Do I need to salt the onions before I mix the batter?
Not in this recipe, and this is where it differs from most. The salt goes in with everything else and the liquid it draws out of the onions is what binds the batter, because there is no water in it. Recipes that add water do tell you to salt and squeeze first, and they are right to; ours would fall apart if you did. What matters here instead is the 10 to 15 minute rest after the flour goes in.
Why do my bhajis fall apart in the oil?
Usually one of three things. The mixture has not rested long enough, so the flour has not taken up the onion liquid and there is nothing holding it together yet. The oil is too cool, so the outside never sets. Or it was moved too early: lower each one in and leave it alone for a full minute before you touch it. Squeezing them into tight balls does not help either, since a compressed bhaji is heavier and more likely to shed its edges.
Can I make them ahead and reheat them?
They are best straight from the pan, but they do reheat well if you treat them right. I spread them out in a hot oven or an air fryer for a few minutes rather than a microwave, which turns them limp. Several readers told me their leftovers re-crisped beautifully in the air fryer the next day, so a quick blast of dry heat is your friend.
How thick should the batter actually be?
Thick enough to hold its shape on a spoon and not slide off. This one gets there by resting rather than by adding water, so judge it after the 10 to 15 minutes and not before: straight after the flour goes in it looks far too dry. If it is still crumbly once it has rested, a teaspoon of water is all it should need. If it has gone slack because the bowl sat for an hour, a spoonful of gram flour brings it back.