Ton jiru is miso soup's heartier, more substantial cousin - thin slices of pork belly simmered with daikon, carrot, potato and burdock root in a rich miso broth until it's practically a meal in a bowl. Where regular miso soup is a light accompaniment, ton jiru is the main event, the kind of thing Japanese families eat on cold nights to warm up from the inside out.
What makes it special is the way the pork fat renders into the broth as it simmers, giving the miso a savoury depth you just don't get from a quick dashi-and-tofu soup. Root vegetables soak up that flavour and turn meltingly soft, so every spoonful has a bit of everything.
This is genuinely one of the easiest one-pot Japanese dishes you can make - there's no special technique, just a good simmer and a decent miso to finish. Serve it in big bowls with a side of rice and pickles for a proper cold-weather dinner.
