Japanese Wakame Seaweed Soup

Featured in: Quick Treats

This comforting Japanese bowl brings together nutrient-rich wakame seaweed with silky tofu cubes in a savory dashi-miso broth. The preparation involves soaking dried wakame until tender, simmering it with tofu in aromatic dashi stock, then finishing with dissolved miso paste for that characteristic umami depth. A touch of soy sauce and optional sesame oil rounds out the flavors.

The result is a light yet satisfying soup that delivers essential minerals like iodine while remaining gentle on the digestive system. Perfect as a starter or paired with steamed rice for a complete vegetarian meal.

Updated on Wed, 21 Jan 2026 10:38:00 GMT
A close-up of steaming wakame soup, highlighting tender seaweed, soft tofu cubes, and vibrant green scallions. Save
A close-up of steaming wakame soup, highlighting tender seaweed, soft tofu cubes, and vibrant green scallions. | munchhug.com

The steam rising from my first bowl of wakame soup at a tiny Tokyo ramen shop still lingers in my senses more than the flavor itself. It was midnight, raining, and I had been walking for hours in search of something authentic.

My host mother in Kyoto taught me that the secret lies in never letting the miso boil, something she learned from her grandmother. That one rule transformed my soup making forever.

Ingredients

  • 8 g dried wakame seaweed: Rehydrates into tender ribbons that carry the miso flavor beautifully
  • 4 cups dashi stock: The foundation, use vegetarian dashi made from kombu for a plant based version
  • 100 g silken or firm tofu: Adds protein and a soft texture that contrasts with the seaweed
  • 2 scallions: Fresh brightness and color to finish each bowl
  • 2 tbsp white miso paste: Fermented soybean paste that brings depth and umami
  • 1 tsp soy sauce: Enhances the savory notes without overpowering the miso
  • 1 tsp sesame oil: Optional but adds a lovely nutty finish

Instructions

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Prepare the seaweed:
Soak dried wakame in cold water for 5 minutes until it expands and turns vibrant green, then drain well
Warm the broth:
Bring dashi stock to a gentle simmer over medium heat, watching for tiny bubbles to form around the edges
Add tofu and wakame:
Carefully slide in cubed tofu and rehydrated seaweed, letting them swim together for 2 to 3 minutes
Blend the miso:
Whisk miso paste with a ladleful of hot broth in a separate bowl until completely smooth
Combine gently:
Pour the miso mixture back into the soup, add soy sauce and sesame oil, stir once, and remove from heat immediately
Finish and serve:
Ladle into bowls and scatter fresh scallion slices across the top while steam still rises
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Season soups, salads, meats, and vegetables evenly while cooking with quick, one-handed grinding.
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In a ceramic bowl, wakame soup glistens with aromatic dashi broth, silken tofu, and fresh sliced scallions. Save
In a ceramic bowl, wakame soup glistens with aromatic dashi broth, silken tofu, and fresh sliced scallions. | munchhug.com

This soup became my go to comfort during cold graduate school nights when time and money were both scarce.

Making It Your Own

The beauty of wakame soup is how gracefully it welcomes additions without losing its identity.

Perfect Pairings

A bowl of steamed short grain rice turns this light soup into a satisfying meal on its own.

Storage and Make Ahead

The soup keeps beautifully refrigerated for up to three days, though the tofu firms up slightly as it rests.

  • Reheat gently over low heat and never let it reach a rolling boil
  • Add fresh scallions just before serving to maintain their crunch
  • The flavors actually deepen overnight making it excellent for meal prep
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A hearty serving of Japanese wakame soup, featuring rehydrated seaweed and tofu floating in a savory broth. Save
A hearty serving of Japanese wakame soup, featuring rehydrated seaweed and tofu floating in a savory broth. | munchhug.com

There is something profoundly comforting about a soup that requires so little yet gives so much warmth.

Recipe Guide

What does wakame taste like?

Wakame has a delicate, slightly sweet flavor with subtle ocean notes. When rehydrated, it becomes tender and silky, absorbing the flavors of the dashi-miso broth beautifully.

Can I use other types of seaweed?

While wakame is traditional for its tender texture, you can substitute with hijiki or kombu strips. Keep in mind that kombu requires longer cooking time to soften, while hijiki has a stronger, earthier flavor.

Why shouldn't I boil miso?

Boiling miso paste destroys its beneficial enzymes and probiotics, and can make the flavor bitter. Always dissolve miso in a separate bowl with hot broth first, then stir it into the soup just before serving.

Is this soup suitable for meal prep?

This soup is best enjoyed fresh, but you can prepare the dashi broth and wakame-tofu base ahead. Add the miso seasoning just before serving to preserve its delicate flavor and nutritional benefits.

How can I make this more filling?

Add cooked udon or soba noodles directly to the broth, or serve alongside steamed short-grain rice. You can also include shiitake mushrooms, sliced carrots, or baby spinach for extra substance.

Japanese Wakame Seaweed Soup

Delicate dashi broth with rehydrated wakame and silken tofu, seasoned with white miso and soy sauce.

Prep duration
10 min
Heat time
10 min
Complete duration
20 min
Created by Samantha Reed


Skill level Easy

Heritage Japanese

Output 4 Portions

Nutrition preferences Meat-free, No dairy, No gluten

Components

Seaweed and Broth

01 0.3 oz dried wakame seaweed
02 4 cups dashi stock (use vegetarian dashi for vegetarian option)

Vegetables and Tofu

01 3.5 oz silken or firm tofu, cubed
02 2 scallions, thinly sliced

Seasoning

01 2 tbsp white miso paste
02 1 tsp soy sauce (gluten-free if needed)
03 1 tsp sesame oil (optional)

Method

Phase 01

Rehydrate the Wakame: Place dried wakame in a small bowl and cover with cold water. Let soak for 5 minutes until fully rehydrated and expanded. Drain well and set aside.

Phase 02

Heat the Dashi Broth: Pour dashi stock into a medium saucepan and bring to a gentle simmer over medium heat. Avoid boiling to preserve delicate flavor.

Phase 03

Add Tofu and Wakame: Carefully add cubed tofu and rehydrated wakame to the simmering broth. Let cook for 2-3 minutes to heat through and allow flavors to meld.

Phase 04

Dissolve the Miso: Remove a ladleful of hot broth from the pot and place in a separate bowl. Whisk in miso paste until completely smooth and dissolved, then return mixture to the soup.

Phase 05

Season and Finish: Stir in soy sauce and sesame oil if using. Heat for 1 additional minute, but do not let the soup boil as this will diminish the miso's probiotic benefits.

Phase 06

Serve and Garnish: Ladle hot soup into serving bowls immediately. Top with thinly sliced scallions for fresh contrast and aromatic finish.

Tools needed

  • Medium saucepan
  • Ladle
  • Small mixing bowl
  • Knife and cutting board

Allergy alerts

Review ingredients carefully for potential allergens and seek professional medical guidance if concerned.
  • Contains soy (tofu, miso, soy sauce)
  • Verify miso and soy sauce labels for gluten if following strict gluten-free diet
  • Sesame oil may be an allergen for some individuals

Dietary info (per portion)

Values shown are estimates only - please consult healthcare providers for specific advice.
  • Energy: 65
  • Lipids: 2 g
  • Carbohydrates: 7 g
  • Proteins: 5 g