Clear Gul Dubu Guk (Korean Oyster Tofu Soup)
Quick answer
- Total time
- 30 min
- Level
- Easy
- Servings
- 3 servings
- Ingredients
- 8
About this dish
Gul-dubu-guk is a Korean oyster tofu soup, a winter dubu guk that pairs plump seasonal oysters with soft tofu in a clear kelp broth.
Read more
Unlike plain dubu-jangguk, this version is seafood-forward, with briny oyster aroma leading the bowl. Timing the oysters precisely is the central technique: they go in just before the broth reaches a full boil, and even a minute too long on the heat turns them tough and grainy. Large-cut tofu blocks absorb the shellfish-infused liquid as they simmer, carrying the oyster depth into each spoonful. Thinly sliced radish adds natural sweetness, while soup soy sauce and garlic keep the seasoning clean.
Ingredients
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Instructions
Read the steps as a cooking flow: prep, heat, seasoning, doneness control, and finish.
- 1Season
Place 220 g fresh oysters in 3% salt water, using 15 g salt for 500 ml water.
Do not rub them hard. Swirl gently to loosen grit or shell bits, then drain well in a colander.
- 2Control
Slice 150 g Korean radish into thin 0.4 cm pieces so it softens quickly and sweetens the broth.
Cut 300 g soft tofu into generous 2 by 2 by 1.5 cm cubes to reduce breakage while simmering.
- 3Control
Put 1000 ml kelp stock and the sliced radish in a pot over medium heat.
Once it begins to boil, keep it at a steady simmer for about 6 minutes, until the radish edges look semi-translucent.
- 4Season
Add 1 teaspoon minced garlic and 1 tablespoon soup soy sauce, then stir the broth lightly to dissolve the seasoning.
Hold back the salt for now because the oysters will add more briny seasoning later.
- 5Control
Add the tofu and keep the soup over medium heat for about 3 minutes, just until the cubes are hot through.
Avoid poking them often with chopsticks. Gently nudge the broth so it flows between the pieces.
- 6Season
Add the oysters just before the broth reaches a strong boil, then cook only 30 seconds to 1 minute.
When they look plump, add 30 g green onion, adjust with salt, and turn off the heat immediately.
Practical Cooking Checks
The cues that matter most while cooking.
- Key technique
- Gul-dubu-guk sets plump winter oysters alongside silky soft tofu in a clear, kelp-based broth.
- Finish cue
- Once it begins to boil, keep it at a steady simmer for about 6 minutes, until the radish edges look semi-translucent.
- Avoid this
- Add oysters near the end to avoid overcooking and toughness.
Cooking decision evidence
Calculated Charim data and applicable official cooking and food safety guidance.
This recipe
30min, 8 ingredients
Category median
45min, 8 ingredients
Based on 310 recipes
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