Miso Soup
Kombu and dried shiitake steeped, never boiled, then miso whisked in off the heat. Twenty minutes, mostly waiting.
- Prep
- 5m
- Cook
- 15m
- Waiting
- 30m
- Total
- 50m
- Serves
- 4
- Effort
- Easy
Method
Instant kombu dashi powder instead of a 30-minute steep — you lose some roundness and gain half an hour.
Tap a step number to mark it done. Tap an ingredient once for got it, twice for need it.
| a 10 cm piece | Steep the kombu and shiitake in cold water for 30 minutes, then heat gently 10m A cold start draws out glutamate cleanly. Lift the kombu out before the water simmers. | Bring the steeped dashi to 80°C and add the tofu and wakame 5m Small bubbles at the edge, no rolling boil. Kombu turns slippery and bitter above a simmer. | Whisk the miso through a sieve into the hot dashi, off the heat 3m Never let it boil after the miso goes in. Boiling flattens the aroma and dulls the texture. | |
| 3 | ||||
| 1 litre | ||||
| 300 g | ||||
| 2 tsp | ||||
| 4 tbsp | ||||
| 2 | ||||
-
Steep the kombu and shiitake in cold water for 30 minutes, then heat gently
10m- kombu a 10 cm piece
- dried shiitake 3
- cold water 1 litre
A cold start draws out glutamate cleanly. Lift the kombu out before the water simmers.
-
Bring the steeped dashi to 80°C and add the tofu and wakame
5m- from 1 Steep the kombu and shiitake in cold water for 30 minutes, then heat gently
- silken tofu 300 g
- dried wakame 2 tsp
Small bubbles at the edge, no rolling boil. Kombu turns slippery and bitter above a simmer.
-
Whisk the miso through a sieve into the hot dashi, off the heat
3m- from 2 Bring the steeped dashi to 80°C and add the tofu and wakame
- white miso 4 tbsp
- spring onion greens 2
Never let it boil after the miso goes in. Boiling flattens the aroma and dulls the texture.
| 1 tsp | Dissolve the dashi powder in hot water and add the tofu and wakame 5m | Whisk the miso through a sieve into the hot dashi, off the heat 3m Check the powder for bonito if you need it vegetarian; kombu-only versions are widely sold. | |
| 1 litre | |||
| 300 g | |||
| 2 tsp | |||
| 4 tbsp | |||
| 2 |
-
Dissolve the dashi powder in hot water and add the tofu and wakame
5m- instant kombu dashi powder 1 tsp
- hot water 1 litre
- silken tofu 300 g
- dried wakame 2 tsp
-
Whisk the miso through a sieve into the hot dashi, off the heat
3m- from 1 Dissolve the dashi powder in hot water and add the tofu and wakame
- white miso 4 tbsp
- spring onion greens 2
Check the powder for bonito if you need it vegetarian; kombu-only versions are widely sold.
Why nothing boils
Kombu gives up glutamate readily at low temperature; push it past a simmer and you also extract alginates and bitter compounds, which is what makes homemade dashi go cloudy and faintly slippery. Dried shiitake contribute inosinate, and the two together taste far more savoury than either alone — a genuine multiplication, not a sum. Miso is a live ferment carrying volatile aroma molecules; whisking it in off the heat preserves them, while a boil drives them off and leaves the flat, salty soup most people remember.
Notes
- Push the miso through a small sieve with the back of a spoon. It disperses instantly and you never get pale lumps.
- Traditional dashi uses katsuobushi, dried bonito. The kombu-shiitake version here is fully plant-based and keeps its savoury depth.
- The strained kombu and shiitake are good chopped and simmered with soy and mirin for five minutes. Do not bin them.