This Japanese seaweed soup is a comforting and nutritious dish that brings the flavors of the ocean to your table. It's a simple yet flavorful soup that can be enjoyed as a light meal or a starter. The combination of seaweed, soy sauce, and sesame oil creates a delightful umami taste that is both soothing and satisfying.
Some ingredients in this recipe might not be commonly found in every household. Nori is a type of seaweed that is often used in Japanese cuisine, typically available in the international or Asian section of supermarkets. Sesame oil adds a distinct nutty flavor and can usually be found in the oil section. Make sure to check these sections when shopping for this recipe.

Ingredients for Japanese Seaweed Soup Recipe
Water: The base of the soup, providing the necessary liquid.
Nori: A type of seaweed that adds a unique oceanic flavor and texture.
Soy sauce: Adds a salty and umami depth to the soup.
Sesame oil: Provides a rich, nutty flavor that complements the seaweed.
Salt: Enhances the overall taste of the soup.
Sugar: Balances the flavors with a hint of sweetness.
Garlic: Adds a robust and aromatic flavor to the soup.
Green onions: Used as a garnish, adding freshness and a mild onion flavor.
Technique Tip for Making Seaweed Soup
When preparing nori for the soup, lightly toast the seaweed sheet over an open flame or in a dry skillet for a few seconds on each side. This enhances its flavor and makes it easier to cut into strips.
Suggested Side Dishes
Alternative Ingredients
nori - Substitute with wakame: Wakame is another type of seaweed that has a similar texture and flavor profile to nori, making it a suitable replacement in soups.
soy sauce - Substitute with tamari: Tamari is a gluten-free alternative to soy sauce and has a similar umami flavor, making it a good substitute.
sesame oil - Substitute with olive oil: Olive oil can be used as a substitute for sesame oil, though it will lack the nutty flavor. Adding a small amount of toasted sesame seeds can help mimic the taste.
salt - Substitute with miso paste: Miso paste adds a salty and umami flavor to the soup, enhancing its depth and complexity.
sugar - Substitute with honey: Honey can be used as a natural sweetener and will add a slight floral note to the soup.
garlic - Substitute with garlic powder: Garlic powder can be used in place of fresh garlic, though it will have a slightly different texture and intensity.
green onions - Substitute with chives: Chives have a similar mild onion flavor and can be used as a garnish or mixed into the soup.
Alternative Recipes Similar to This Seaweed Soup
How to Store or Freeze This Seaweed Soup
- Allow the Japanese seaweed soup to cool completely before storing. This prevents condensation from forming inside the container, which can dilute the soup and affect its flavor.
- Transfer the cooled soup into an airtight container. Glass containers with tight-fitting lids are ideal as they do not absorb odors and keep the soup fresh.
- Label the container with the date of preparation. This helps you keep track of how long the soup has been stored.
- Store the container in the refrigerator if you plan to consume the soup within 3-4 days. The seaweed and green onions will maintain their texture and flavor during this period.
- For longer storage, consider freezing the soup. Pour the soup into freezer-safe containers or heavy-duty freezer bags. Leave some space at the top to allow for expansion as the soup freezes.
- If using freezer bags, lay them flat in the freezer to save space and ensure even freezing. Once frozen, you can stack them upright to maximize freezer space.
- When ready to enjoy, thaw the soup in the refrigerator overnight. This gradual thawing helps maintain the soup's texture and flavor.
- Reheat the soup gently on the stovetop over medium heat, stirring occasionally. Avoid boiling, as this can cause the seaweed to become overly soft and the green onions to lose their vibrant color.
- If the soup appears too thick after reheating, add a splash of water or vegetable broth to achieve the desired consistency.
- Garnish with fresh green onions just before serving to enhance the soup's flavor and presentation.
How to Reheat Leftovers
Gently reheat the Japanese seaweed soup on the stovetop over medium-low heat. Stir occasionally to ensure even warming and prevent the seaweed from sticking to the bottom of the pot. This method helps retain the delicate flavors of the soy sauce and sesame oil.
Use a microwave-safe bowl to reheat the soup in the microwave. Cover the bowl with a microwave-safe lid or a damp paper towel to prevent splatters. Heat on medium power in 1-minute intervals, stirring in between, until the soup is warmed through. This method is quick and convenient for a single serving.
For a more flavorful twist, reheat the soup in a small saucepan and add a splash of vegetable broth or chicken broth to enhance the taste. This can also help if the soup has thickened too much after refrigeration.
If you prefer a more robust flavor, add a few drops of soy sauce or a dash of sesame oil while reheating. This can refresh the taste and aroma of the soup.
To preserve the freshness of the green onions, consider adding them only after reheating the soup. This will keep their vibrant color and crisp texture intact.
For an added nutritional boost, toss in some fresh spinach or tofu cubes while reheating. These ingredients will cook quickly and complement the flavors of the Japanese seaweed soup.
Essential Tools for Making Seaweed Soup
Pot: Used to boil water and cook the soup.
Knife: Essential for mincing garlic and chopping green onions.
Cutting board: Provides a safe surface for chopping and mincing ingredients.
Measuring spoons: Ensures accurate measurement of soy sauce, sesame oil, salt, and sugar.
Wooden spoon: Ideal for stirring the soup and mixing ingredients well.
Ladle: Useful for serving the soup into bowls.
Bowl: Needed for serving the finished soup.
How to Save Time on Making This Seaweed Soup
Prepare ingredients in advance: Chop green onions and mince garlic ahead of time to streamline the cooking process.
Use pre-cut seaweed: Purchase pre-cut nori strips to save time on cutting.
Boil water quickly: Use an electric kettle to boil water faster before transferring it to the pot.
Measure seasonings beforehand: Measure out soy sauce, sesame oil, salt, and sugar before starting to cook.
Double the recipe: Make a larger batch and store leftovers for a quick meal later.

Japanese Seaweed Soup
Ingredients
Main Ingredients
- 4 cups Water
- 1 sheet Nori (seaweed) cut into strips
- 1 tablespoon Soy sauce
- 1 teaspoon Sesame oil
- 1 teaspoon Salt to taste
- 1 teaspoon Sugar
- 2 cloves Garlic minced
- 2 stalks Green onions chopped
Instructions
- 1. Boil water in a pot.
- 2. Add minced garlic and cook for 2 minutes.
- 3. Add soy sauce, sesame oil, salt, and sugar. Stir well.
- 4. Add seaweed strips and cook for another 5 minutes.
- 5. Garnish with chopped green onions before serving.
Nutritional Value
Keywords
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