Wakame Seaweed Soup

Featured in: Simple One-Pot Home Comforts

This traditional Japanese seaweed soup combines rehydrated wakame with silken tofu in a savory dashi broth. The soup comes together in just 20 minutes, making it an ideal light appetizer or side dish. White miso paste provides depth and umami, while soy sauce and optional sesame oil add layers of flavor.

The key to perfect wakame soup is proper rehydration of the seaweed and gentle handling of the miso paste—blend it with hot broth before adding to prevent boiling, which preserves its beneficial enzymes and delicate flavor.

Updated on Wed, 21 Jan 2026 08:33:00 GMT
Tender wakame seaweed and soft tofu float in a warm, savory dashi broth, garnished with fresh scallions. Save
Tender wakame seaweed and soft tofu float in a warm, savory dashi broth, garnished with fresh scallions. | rusticmint.com

The steam rising from my first bowl of wakame soup at a tiny Tokyo ramen shop changed how I thought about broth entirely. The chef had slid it across the counter as a starter, this impossibly clear golden liquid with floating clouds of seaweed and tender tofu cubes. I watched him prepare it through the open kitchen, noting how gently he stirred the miso, never letting the broth reach a rolling boil. That quiet attention to detail made something so simple taste extraordinary.

Last winter my friend Mei came over exhausted from residency shifts and I made this soup for her. She took one sip and immediately asked for the recipe, saying it reminded her of her grandmothers kitchen in Osaka. We ended up sitting at my counter for hours, just talking over second bowls while the snow fell outside.

Ingredients

  • Dried wakame seaweed: A little goes a long way since it expands dramatically when rehydrated
  • Dashi stock: The foundation of Japanese cooking, use kombu and shiitake for vegetarian version
  • Silken tofu: Creates those lovely delicate clouds floating in your broth
  • White miso paste: Gentler and sweeter than red miso, perfect for light soups
  • Soy sauce: Just enough to deepen the umami without overpowering
  • Sesame oil: Optional but adds a beautiful nutty finish
  • Scallions: Fresh green brightness to balance the savory broth

Instructions

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Wake up the wakame:
Place the dried seaweed in a small bowl and cover with cold water. Let it sit for about 5 minutes until it transforms from brittle to tender and expands to several times its original size.
Gently warm the dashi:
Pour your dashi stock into a medium saucepan and bring it to a gentle simmer over medium heat. You want it hot but never aggressively boiling.
Add tofu and wakame:
Carefully slide in your cubed tofu and the drained wakame. Let them warm through and become friends in the broth for about 2 to 3 minutes.
Dissolve the miso:
Remove a ladleful of hot broth and whisk in the miso paste until completely smooth. This prevents lumps and ensures even flavor distribution throughout the soup.
Combine and season:
Pour the miso mixture back into the main pot and stir gently. Add the soy sauce and sesame oil if using, then let everything heat through for one final minute.
Serve with love:
Ladle the hot soup into bowls and scatter fresh scallion slices across the top. Serve immediately while the steam still carries that wonderful seaweed aroma.
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This soup has become my go to when anyone in my house is feeling under the weather. Something about that clear savory broth feels restorative in a way heavier meals cannot match.

Making It Your Own

The beauty of wakame soup lies in how adaptable it is to whatever you have in your refrigerator. I have added sliced mushrooms, baby spinach, even sweet corn kernels depending on my mood and what needs using up.

Getting The Broth Right

Homemade dashi makes a noticeable difference but high quality granular dashi works perfectly for weeknight cooking. The key is tasting as you go and adjusting the seasoning to your personal preference.

Perfect Pairings

While this soup shines on its own as a light starter, it becomes a complete meal with the right accompaniments. A bowl of steamed short grain rice and some simple pickles transform it into dinner.

  • Pair with tempura vegetables for a restaurant style Japanese meal at home
  • Add a soft boiled egg for extra protein and richness
  • Leftovers keep beautifully in the fridge for two days though the tofu will firm up slightly
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A comforting bowl of Japanese Wakame Soup, with silken tofu cubes and rehydrated seaweed in miso broth. Save
A comforting bowl of Japanese Wakame Soup, with silken tofu cubes and rehydrated seaweed in miso broth. | rusticmint.com

There is something deeply comforting about a bowl of soup that comes together so quickly yet nourishes so completely. Perfect for those nights when you need warmth without the fuss.

Common Questions

Is wakame soup healthy?

Yes, wakame seaweed is rich in iodine, minerals, and vitamins. Combined with tofu for protein and dashi for flavor, it's a nutritious, low-calorie option that supports thyroid health and provides essential nutrients.

Can I make this soup vegan?

Absolutely. Use kombu and shiitake mushroom dashi instead of fish-based dashi stock. Ensure your miso paste doesn't contain bonito flakes, and this becomes a completely plant-based dish.

Why shouldn't I boil miso paste?

Boiling miso paste destroys its beneficial probiotics and enzymes, while also making the flavor overly strong and salty. Always dissolve miso in hot broth separately, then stir it in at the end for the best taste and nutritional benefits.

What can I add to wakame soup?

Common additions include sliced mushrooms, spinach, carrots, or enoki mushrooms. Some people add cooked noodles like udon or soba for a heartier version. Keep additions simple to maintain the delicate broth flavor.

How long does wakame soup keep?

Store in an airtight container in the refrigerator for up to 2 days. Reheat gently without boiling to preserve the miso's benefits. The wakame will continue absorbing liquid, so you may need to add more dashi when reheating.

What's the difference between wakame and other seaweeds?

Wakame has a delicate, slightly sweet flavor and tender texture when rehydrated. Unlike nori which is crispy, or kombu which is thick and tough, wakame becomes silky and soft, making it perfect for soups and salads.

Wakame Seaweed Soup

Nourishing Japanese seaweed soup with tender wakame, tofu, and delicate dashi broth.

Prep Duration
10 minutes
Time to Cook
10 minutes
All Steps Time
20 minutes
Created by Benjamin Thomas


Skill Level Easy

Tradition Japanese

Makes 4 Portions

Nutrition Info Vegetarian-Friendly, No Dairy, No Gluten

What You'll Need

Seaweed and Broth

01 0.28 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

Step 01

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

Step 02

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

Step 03

Add Tofu and Wakame: Carefully add the cubed tofu and rehydrated wakame to the simmering broth. Let cook for 2–3 minutes until the tofu is heated through.

Step 04

Prepare the Miso: In a separate small bowl, ladle about ½ cup of the hot broth. Whisk the miso paste into the hot liquid until completely smooth and dissolved.

Step 05

Combine and Season: Return the miso mixture to the saucepan, stirring gently to incorporate. Add the soy sauce and sesame oil if using. Heat for 1 additional minute, being careful not to boil the soup.

Step 06

Serve and Garnish: Ladle the hot soup into serving bowls immediately. Top with the sliced scallions and serve while steaming hot.

Tools Needed

  • Medium saucepan
  • Ladle
  • Small mixing bowl
  • Knife and cutting board
  • Whisk or fork

Allergy Notes

Look over every ingredient for allergens, and reach out to your doctor if you're unsure.
  • Contains soy (tofu, miso paste, soy sauce).
  • Some miso pastes and soy sauces contain gluten—verify labels for certified gluten-free options if needed.
  • Sesame oil is a potential allergen for some individuals.

Nutrition Breakdown (each portion)

Provided as a general guide by Rustic Mint—always speak with your doctor for dietary help.
  • Energy (Kcal): 65
  • Lipids: 2 g
  • Carbohydrates: 7 g
  • Proteins: 5 g