Korean Mussel Seaweed Soup

Quick answer

Total time: 35 min
Level: Easy
Servings: 2 servings
Ingredients: 7

About this dish

Honghap-maesaengi-guk is a winter specialty from Korea's southern coast that pairs fresh mussels with maesaengi, a hair-thin green seaweed harvested in cold water.

The seaweed is briefly sautéed in sesame oil before water and mussels are added, and as the pot simmers, the broth turns a deep green with a mineral-rich ocean fragrance. Soup soy sauce and garlic provide just enough seasoning to frame the natural salinity without masking it. The textural contrast is central to the experience: maesaengi slides across the palate in silky strands while the mussels offer a firm, meaty chew. Each spoonful delivers both the vegetal depth of seaweed and the concentrated brininess of shellfish, making it a dish greater than the sum of its two main ingredients.

Ingredients

servings

IngredientAmountUnit

maesaengi seaweed120 gg

shelled mussels180 gg

minced garlic1 tsptsp

sesame oil1 tsptsp

soup soy sauce1 tbsptbsp

salt½ tsptsp

water900 mlml

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Instructions

Read the steps as a cooking flow: prep, heat, seasoning, doneness control, and finish.

6 steps

1

Step

Place 120 g maesaengi seaweed in cold water and loosen it gently with your fingertips to release grit.

Drain it in a sieve without pressing hard, so the fine strands stay intact.
2

Step

Rinse 180 g shelled mussels briefly under running water, checking for shell fragments and sand.

Do not soak them for long, because the mussels can lose some of their briny flavor.
3

Control

Add 1 tsp sesame oil and 1 tsp minced garlic to a pot, then cook over low heat for about 30 seconds.

Stop before the garlic turns golden, keeping the aroma clean rather than toasted.
4

Control

Add the mussels and stir over medium heat for 1 minute, just until their surface firms slightly.

Pour in 900 ml water, bring it to a boil, and skim off foam for a cleaner broth.
5

Control

Stir in 1 tbsp soup soy sauce and simmer over medium-low heat for 5 minutes to draw flavor from the mussels.

Add the maesaengi and cook only 2 to 3 minutes, keeping its green color.
6

Season

Taste the broth and add up to 0.5 tsp salt in portions only if needed.

Turn off the heat, let the soup settle briefly, and ladle carefully because the green broth stays very hot.