Korean Mussel Seaweed Soup
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.
Adjust Servings
Instructions
- 1
Gently rinse maesaengi in cold water and drain through a sieve.
- 2
Rinse mussels thoroughly to remove remaining grit.
- 3
Warm sesame oil and garlic over low heat for 30 seconds.
- 4
Add mussels, stir for 1 minute, then pour in water and bring to a boil.
- 5
Add soup soy sauce, simmer 5 minutes, then add maesaengi and cook 3 minutes.
- 6
Season with salt and turn off heat immediately for a tender texture.
As an Amazon Associate, we may earn from qualifying purchases.
Tips
Nutrition (per serving)
More Recipes

Korean Shrimp Seaweed Soup
Saeu-miyeok-guk is a Korean seaweed soup made with shrimp instead of the more common beef, producing a lighter bowl with a distinct marine character. The preparation begins by sautéing rehydrated seaweed and garlic in sesame oil, a step that reduces any raw ocean smell and builds a nutty base. Shrimp are added to the pan and cooked just until they begin to turn pink, at which point their natural sweetness melts into the oil. Water is poured in and the soup simmers on medium-low heat for twelve minutes, allowing the mineral-rich seaweed and the shellfish umami to merge into a cohesive broth. Soup soy sauce and salt provide the final seasoning. The texture of the slippery seaweed against the firm shrimp makes each spoonful interesting, and the overall effect is clean and ocean-forward - a lighter alternative to the traditional beef-based version.

Korean Seaweed Winter Soup
Maesaengi-guk is a winter soup made with capsosiphon, a fine, thread-like green seaweed harvested along Korea's southern coast from December to February. Garlic is briefly sauteed in sesame oil, anchovy stock is poured in, and the seaweed is added and loosened with chopsticks to prevent clumping. The entire cooking time after adding the maesaengi is only three to four minutes; any longer and its delicate ocean aroma fades. After turning off the heat, the soup rests for two minutes so the seasoning of soup soy sauce and black pepper distributes evenly through the silky, deep-green broth.

Korean Seaweed and Oyster Soup
Maesaengi-gul-guk combines two peak-winter ingredients, capsosiphon seaweed and fresh oysters, in a single light broth. Julienned radish and garlic are sauteed in sesame oil to establish sweetness, then water is added and brought to a boil before the oysters go in for three minutes. The seaweed is added last and simmered for only two minutes to preserve its silky texture and subtle marine scent. Soup soy sauce and a pinch of salt are the only seasonings needed, since the oysters release enough brininess to flavor the broth on their own.

Korean Buchu Honghap Guk (Chive Mussel Soup)
Debearded mussels are simmered with radish in water to extract a briny, full-bodied stock, with rice wine added to neutralize any fishy notes. Soup soy sauce and garlic season the broth mid-cook, and Korean chives plus black pepper go in at the very end for a fragrant, clean finish. Cooking uncovered helps off-flavors escape, and any mussels that remain closed after five minutes should be removed.

Korean Maesaengi Oyster Kalguksu
Maesaengi oyster kalguksu is a Korean seasonal noodle soup featuring maesaengi - a hair-thin, dark green seaweed harvested along Korea's southern coast in winter - and fresh shucked oysters. The broth starts with anchovy-kelp stock, seasoned simply with soup soy sauce, minced garlic, and salt. Knife-cut noodles go in first and cook for four to five minutes. Oysters are added next and simmered for only two minutes to keep them plump; overcooking turns them rubbery. Maesaengi goes in last, needing just one minute of heat to bloom its vivid green color and release its briny ocean aroma. The timing is critical: each ingredient enters the pot at a different stage to preserve its texture. Sliced scallion finishes the bowl, and the dish is best made between December and February when both maesaengi and oysters are at peak freshness.

Korean Mussel Soup Noodles
Honghap tangmyeon is a mussel noodle soup where a generous amount of mussels is simmered to produce a deeply briny, clear broth. Korean radish cooks alongside the mussels, lending the liquid a natural sweetness and a clean finish. Soup soy sauce and cooking wine adjust the seasoning, while minced garlic and green onion build an aromatic layer that keeps any fishiness at bay. A light dusting of black pepper over the steaming bowl sharpens the broth's marine character and warms the palate.