A thick, spicy Korean stew built on well-fermented kimchi, with pork belly, shiitake and tofu simmered in a deep red broth. It is better the next day, and the sourer your kimchi, the better it tastes.
Place the kimchi and its brine into a wide shallow pan. Add the sliced pork belly, mushrooms, onion, and the white parts of the spring onions.
Sprinkle in the salt, sugar, gochugaru, and gochujang, then pour in your stock. Add the grated garlic and ginger.
Cover and bring to a gentle boil over medium-high heat. Cook for about 10 minutes, letting the pork start to tenderise and the flavours come together.
Reduce to low and continue simmering for another 20 minutes. The broth will deepen in flavour and the kimchi will soften.
Uncover, give the stew a gentle stir, and place the tofu slices on top. Spoon a bit of broth over them so they warm through and absorb flavour.
Cover again and cook for 15 minutes more. If you prefer a thicker, more concentrated flavour, leave the lid off for the final few minutes to reduce the broth slightly.
Take the pot off the heat and stir in the sesame oil, or put a few drops over each bowl at the table. Top with the green part of the sliced spring onions, chilli flakes, and sesame seeds. Serve piping hot with steamed rice or noodles.
Notes:
Sour kimchi is the whole recipe. Young, fresh kimchi makes a flat stew. If yours is not sharp yet, leave the jar at room temperature for a day or two before you cook, or stir a teaspoon of rice vinegar in at the end.
If it tastes flat, add a splash of fish sauce or a teaspoon of doenjang near the end. Both deepen it in a way more salt cannot. Use doenjang if you are keeping it vegetarian.
Storage: Kimchi Jjigae can be refrigerated for up to 3 days and often tastes better the next day as flavours meld. It freezes well too, but lift the tofu out first, because it turns spongy once frozen.