Seaweed and Seafood Udon Soup

If you’re craving something warm, satisfying, and full of umami, look no further than seaweed and seafood udon soup. This Japanese-inspired noodle soup combines the richness of the sea with the chewy comfort of thick udon noodles. It’s a dish that feels nourishing, light yet filling, and packed with depth in every spoonful.

The base of the soup is a gently flavored dashi broth. Traditionally made from kombu (dried kelp) and bonito flakes, this broth is subtle but deeply savory. It’s the perfect canvas for fresh seafood and delicate seaweed to shine. The broth can be homemade or store-bought, and adding a splash of soy sauce and mirin brings the flavor to life with a balance of salty and sweet.

Seafood options are flexible, so you can use what’s fresh or available. Shrimp, scallops, mussels, and small chunks of white fish are all excellent choices. They cook quickly in the hot broth, releasing their natural juices and infusing the soup with even more flavor. Adding wakame seaweed is key here. It softens as it simmers, adding a silky texture and a mineral-rich taste that complements the seafood beautifully.

Udon noodles are thick, slightly chewy, and incredibly satisfying. Whether you use fresh, frozen, or vacuum-packed noodles, they should be cooked separately and added to the broth just before serving. This keeps them from becoming too soft and allows you to control the final texture.

To finish, garnish the soup with sliced green onions, a soft-boiled egg, a few drops of sesame oil, or even a sprinkle of togarashi (Japanese chili powder) for a hint of heat. The result is a comforting bowl of soup that brings together the sea’s best ingredients in a way that’s both simple and elegant.

Seaweed and seafood udon soup is a great weeknight dinner or a soothing meal for when you want something wholesome and quick. With just a few ingredients and 20 to 30 minutes, you can enjoy a flavorful bowl that warms you from the inside out.

Seaweed and Seafood Udon Soup

3.73 from 147 votes

A delicious and hearty udon soup with seaweed and seafood.

Servings 4 people

Prep Time 30 minutes mins

Cook Time 20 minutes mins

Total Time 50 minutes mins

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Ingredients

  

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• 250 g udon noodles
• 200 g assorted seafood squid, and mussels), such as shrimp
• 2 sheets dried seaweed
• 4 cups stock vegetable or fish
• 1 onion thinly sliced
• 2 cloves garlic minced
• 1 tbsp soy sauce
• 1 tbsp mirin
• 1 tbsp sesame oil
• salt to taste
• Spring onions for garnish

Instructions

 

• In a large pot, bring water to a boil and cook the udon noodles according to the package instructions. Drain and set aside.
• In another pot, heat the sesame oil and sauté the garlic and onion until fragrant.
• Add the seafood and cook until they are slightly firm.
• Add the stock, soy sauce, mirin, and dried seaweed. Bring to a boil and let it simmer for about 10 minutes.
• Add the cooked udon noodles and let it simmer for another 5 minutes.
• Season with salt to taste.
• Serve hot, garnished with spring onions.

Nutrition

Calories: 350kcalCarbohydrates: 60gProtein: 20gFat: 4gFiber: 3g

Calories: 350kcal

Meal Type: Lunch

Cuisine: Japanese

Keyword: Japanese cuisine, soup, udon

Cooking Method: Boiled

Diet: Pescatarian

Time: >45 Min

Level: Easy

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