Miso Soup with Tofu and Wakame

A gentle, savoury Japanese soup built on a proper kombu and bonito dashi, then loosened with miso and dotted with silken tofu, wakame and spring onion. It is quick, comforting and deeply umami. The golden rule: keep the miso just below a simmer so it stays alive and aromatic.

Good miso soup is all about restraint. You want a clean, savoury dashi carrying soft tofu and wakame, with the miso stirred in off the boil so it keeps its gentle sweetness and aroma. It takes minutes, uses a handful of storecupboard Japanese ingredients, and makes a soothing starter or light lunch alongside rice and pickles.

Ingredients

• 1 litre water
• 10g dried kombu — one 10cm piece; a specialist item, from larger supermarkets or Asian shops
• 10g bonito flakes (katsuobushi) — a large handful; omit for vegetarian and use extra kombu plus a dried shiitake
• 4 tbsp white (shiro) miso paste — or half white, half red for a deeper flavour
• 200g silken tofu — cut into 1.5cm cubes
• 2 tbsp dried wakame seaweed
• 2 spring onions — finely sliced
• 1 tsp light soy sauce — optional, to season

Method

1. Wipe the kombu with a damp cloth, leaving any white bloom (that is umami). Put it in a pan with the cold water and leave to steep for 10 minutes if you have time, then set over a low-medium heat.
2. Bring the water slowly towards a simmer. Just before it boils and small bubbles rise, lift out the kombu and discard it; boiling kombu turns the dashi bitter and slimy.
3. Add the bonito flakes, let the liquid come to a brief simmer, then turn off the heat and leave for 2 minutes so the flakes sink. Strain the dashi through a fine sieve and return the clear stock to the rinsed pan.
4. Meanwhile, soak the wakame in a little cold water for 5 minutes until soft and swollen, then drain.
5. Warm the dashi over a low heat. Add the tofu cubes and drained wakame and heat through gently for 2 minutes; do not let it boil hard or the tofu will break up.
6. Put the miso in a small bowl or ladle, add a couple of spoonfuls of the hot dashi and whisk with chopsticks or a fork until smooth, then stir it back into the pan.
7. Keep the soup just below a simmer and never let it boil once the miso is in, or you will lose the aroma. Taste and add the soy sauce only if it needs more depth.
8. Ladle into bowls, scatter with spring onions and serve straight away while fragrant.

Serve it with

• Steamed Japanese short-grain rice
• Salmon teriyaki or grilled mackerel
• Cucumber and sesame salad
• Japanese pickles (tsukemono)
• Chicken katsu or tofu katsu

Why this works

Kombu gives glutamate and bonito gives inosinate; together they create a powerful umami synergy that makes the broth taste rich without any meat. Adding the miso off the boil preserves its volatile aromas and living cultures.

Common swaps

• Use dashi powder (1 tsp in 1 litre hot water) to skip the kombu and bonito entirely
• Swap silken tofu for firm tofu if you prefer it to hold its shape
• Replace wakame with a few leaves of baby spinach stirred in at the end
• Use red (aka) miso for a bolder, saltier soup, reducing the quantity slightly

Common mistakes to avoid

• Boiling the soup after adding miso, which flattens the flavour and dulls the aroma
• Letting the kombu boil, making the dashi bitter and slippery
• Adding miso straight to the pan so it clumps, rather than loosening it first in a little stock
• Over-seasoning; miso is already salty, so taste before reaching for soy sauce

Storage, freezing & reheating

Storage: Best eaten fresh. Cool any leftovers quickly and keep in the fridge for up to 2 days, then reheat gently.

Reheating: Warm slowly in a pan over a low heat until steaming but not boiling; heating too fiercely spoils the miso's flavour and breaks up the tofu.

Allergen notes: contains Fish, Soya. Always check individual product labels.

Estimated nutrition

Per serving, estimated from typical ingredient values — not a substitute for precise dietary calculation.