Equipment
Ingredients
Kombu Dashi (Vegetarian Broth)
- 600 ml water, cold
- 5 g dried kombu, wiped clean with a damp cloth
Soup Elements
- 3 g dried wakame seaweed
- 150 g silken tofu, cut into 1cm cubes
- 45 g white miso paste
- 2 spring onions, thinly sliced
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 85 kcal
- Protein
- 7 g
- Carbohydrates
- 8 g
- Fat
- 3 g
- Fiber
- 2 g
- Sugar
- 2 g
- Sodium
- 869 mg
- Saturated Fat
- 0 g
- Monounsaturated Fat
- 1 g
- Polyunsaturated Fat
- 2 g
- Potassium
- 79 mg
- Calcium
- 89 mg
- Iron
- 1.5 mg
- Magnesium
- 20 mg
- Phosphorus
- 42 mg
- Zinc
- 0.7 mg
- Vitamin A
- 6 mcg
- Vitamin C
- 2 mg
- Vitamin E
- 0.1 mg
- Vitamin K
- 29 mcg
- Vitamin B6
- 0.1 mg
- Vitamin B12
- 0.0 mcg
- Thiamin
- 0.03 mg
- Riboflavin
- 0.07 mg
- Niacin
- 0.3 mg
- Folate
- 18 mcg
- Water
- 390 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
Place the cold water and dried kombu in a medium saucepan. Let it sit at room temperature for 15 minutes to gently extract the natural umami flavors.
While the broth steeps, place the dried wakame seaweed in a small bowl of water to rehydrate for 5 minutes, then drain completely.
Place the saucepan with the kombu over medium heat. Just before the water reaches a boil, at approximately 90°C/195°F, remove and discard the kombu to prevent the broth from becoming bitter and slimy.
Add the cubed silken tofu and the drained, rehydrated wakame to the hot dashi. Simmer gently for 2 minutes to warm the ingredients through.
Turn off the heat completely. Lower a fine mesh strainer slightly into the hot broth, add the miso paste into the strainer, and use a spoon or chopsticks to dissolve it seamlessly into the soup.
Ladle the hot soup carefully into serving bowls, taking care not to break the delicate tofu cubes. Garnish with thinly sliced spring onions and serve immediately.
Chef's Notes
- Never boil the soup once the miso paste has been added. High heat destroys the delicate aromas, subtle flavors, and beneficial enzymes of the fermented paste.
- Using a dedicated miso muddler or a small fine-mesh strainer ensures the thick paste dissolves completely into the broth without leaving unpleasant, salty lumps at the bottom of the bowl.
- While white (shiro) miso yields a sweeter, lighter soup, you can create a more complex, robust flavor profile by mixing white miso with a darker red (aka) miso, a technique known as an awase blend.
- Silken tofu is traditional and provides a luxurious, melt-in-the-mouth texture, but it is extremely fragile. Stir the soup with a very gentle hand once the tofu is added.
Storage
Refrigerator: 2 days — Store broth separately from tofu and wakame if possible, as wakame becomes overly soft and slimy over time.
Reheating: Reheat gently on the stove over medium-low heat until just steaming. Do not let the soup boil, as it will ruin the miso flavor.
Troubleshooting
The soup tastes somewhat sour, dull, or has a gritty texture.
Cause: The miso paste was boiled, which breaks down its delicate emulsion, diminishes aromatics, and alters the texture.
Fix: Cannot be fixed, though adding a tiny pinch of salt or a drop of soy sauce might rescue some missing savory notes.
Prevention: Always remove the saucepan from the heat source completely before dissolving the miso paste.
The broth has a noticeable bitter or overly oceanic, pungent flavor.
Cause: The kombu was left in the water while it reached a rolling boil.
Fix: Cannot be fixed.
Prevention: Remove the kombu just as small bubbles begin to appear at the edges of the pot, well before a full boil.
Cultural Context
Miso soup (misoshiru) is a fundamental pillar of Japanese cuisine, traditionally served daily alongside steamed rice as part of the classic ichiju-sansai (one soup, three dishes) meal structure. The combination of savory dashi and fermented miso provides a deeply satisfying source of umami, while floating ingredients like tofu and wakame represent a harmonious balance of earth and sea.
