Kongnamul Guk Recipe (콩나물국, Korean Soybean Sprout Soup)

 

Kongnamul guk (콩나물국) is a quiet bowl of soup.There is no thick sauce or rich layer of oil, just pale broth, yellow-headed soybean sprouts and a little green onion.Its appeal is in the contrast between the warm liquid and the gently springy bite of the sprouts.

It fits easily beside a meal that already has plenty of flavor.A bowl of rice, a few cubes of kimchi and something savory from the pan are enough to make it feel at home on the table.The soup brings a lighter spoonful between bites.

Start by choosing the soup base that suits your kitchen: plain water, homemade anchovy-kelp stock, a stock pack, coin broth or a powdered seasoning base.The sprouts remain the main ingredient, while the chosen base changes the depth and flavor of the broth.If you are new to these options, see the Korean Soup Stock Guide: Anchovy Broth, Stock Coins and Dashida before you begin.

A light bowl of kongnamul guk, with cooked soybean sprouts and a little sliced green onion.

Serves: 3–4 as a side soupPrep: about 5–10 minutesCooking: about 15 minutes, including bringing the water to a boilTotal: about 20–25 minutesStyle: mild, clear broth; no chili required

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So, What Is Kongnamul Guk?

Kongnamul guk (콩나물국), also written kongnamulguk, is Korean soybean sprout soup.Kongnamul means soybean sprouts, and guk means soup.The sprouts are cooked in a light broth or water with seasonings such as garlic, salt and green onion.

The soup can be made mild or spicy, with or without a seafood-based stock.Here, it stays clear and gentle.This is a soup served alongside rice, rather than kongnamul gukbap, where rice becomes part of the soup bowl.

What You’ll Need

• 300 g (about 10½ oz) fresh soybean sprouts, labeled kongnamul if available
• 1.2 liters water or prepared stock (5 cups using a 240 ml cup); choose one option below
• 1 tsp finely minced garlic, about 1 large clove
• Up to 1 tbsp Korean soup soy sauce (guk-ganjang), added gradually; regular soy sauce can be used in smaller amounts
• Up to ½ tsp fine salt for the water-based version, plus more only if needed; a seasoned base may need none
• 2 green onions, thinly sliced
• A small pinch of ground black pepper, optional

Use a 15 ml tablespoon and a 5 ml teaspoon.A medium saucepan of about 3 liters gives the sprouts enough space without crowding the rim.For homemade stock, make it before starting this recipe; the timing below assumes the chosen liquid is ready to use.When using stock coins, packs or powder, follow the exact package directions rather than a universal tablet count or spoon measure.

Choose soybean sprouts with large yellow heads, rather than the smaller-headed mung bean sprouts.

Choose Your Soup Base First

Use a total of 1.2 liters of ready-to-cook liquid, whichever method you choose.For a step-by-step explanation, read the Korean Soup Stock Guide.

• Plain water: the simplest, lighter option; season after cooking the sprouts.
• Homemade anchovy-kelp stock: use 1.2 liters strained stock, preferably unsalted.
• Stock pack or coin broth: prepare 1.2 liters according to your package; start with no extra salt.
• Powdered base, such as an anchovy or beef seasoning: use the labeled dilution, and add extra salt or soy sauce only if the cooked soup needs it.

For a vegan pot, select water or a verified plant-based stock.A change in the base changes the flavor and seasoning, while the cooking steps for the sprouts stay the same.

Soybean Sprouts Are Different from Mung Bean Sprouts

Look for ivory stems with large, distinct yellow soybean heads.Mung bean sprouts, called sukjunamul in Korean, usually have much smaller seed ends and a different texture.They can make a pleasant soup, but they do not give the same nutty bite as kongnamul.

Choose a refrigerated package with firm, fresh-looking sprouts.Avoid sprouts that feel slimy or have an unpleasant smell, and follow the package storage instructions.Keep them chilled and use them promptly.Rinsing is part of preparation, but it does not replace thorough cooking.

Let’s Cook

1. Rinse and sort the sprouts.

Wash your hands and rinse the sprouts in a colander under cold running water.Pick out loose skins, damaged sprouts and any obvious debris.Drain well.The fine root ends can stay on; trim long or untidy ones if you prefer, but there is no need to remove every root.

Rinse, sort and drain the sprouts before cooking them thoroughly.

2. Prepare and heat your chosen base.

If using a stock pack, simmer it according to the package directions and remove it; measure 1.2 liters of the prepared broth.If using coins or powder, dissolve the label-directed amount in water to prepare 1.2 liters, choosing a mild flavor for this soup.For plain water or homemade stock, simply measure 1.2 liters into the saucepan.Bring the chosen liquid to a boil and add the minced garlic.Keep all extra salt and soy sauce until the final seasoning stage, especially when the base is already seasoned.This recipe uses an uncovered pot throughout, which makes the bubbling easy to watch.

3. Cook the sprouts thoroughly.

Add the drained sprouts and gently press them into the hot liquid with a spoon.Let the liquid return to a boil, then reduce the heat enough to maintain steady bubbling without overflowing.Cook uncovered for about 8–10 minutes after the boil returns, stirring once or twice so the sprouts cook evenly.Skim any light foam from the surface if you want a tidier broth.

The stems should be tender but still have some spring, and the yellow heads should be cooked through.If the heads still feel hard or taste raw and chalky, keep cooking and check again.The exact time depends on the size and freshness of the sprouts, so do not stop cooking just because the timer ends.

Cook uncovered at a steady simmer until the yellow heads are cooked through and the stems are tender.

4. Finish the seasoning.

Add most of the sliced green onions and simmer for another 1–2 minutes.Taste the broth before adding other seasonings.For plain water or unsalted homemade stock, start with 1 teaspoon of soup soy sauce, then add more gradually, up to the listed tablespoon as needed.For an already seasoned base, use less soy sauce or leave it out if the broth tastes balanced.Add salt only a pinch at a time if the soup still needs it; the listed ½ teaspoon is a guide for the water version, not an amount every base requires.Regular soy sauce is darker, so start with a small amount and use salt for any further adjustment.

The flavor should be light but clearly savory.If too much liquid has evaporated, add a little hot water and taste again.A small pinch of black pepper is optional; keep it restrained if you want the cleanest flavor.

5. Serve hot.

Divide the sprouts and broth between the bowls and add the remaining green onion.Serve beside rice and kimchi or other side dishes.Spoon up some broth and sprouts together, rather than leaving all the solids for the end.The soup is at its best while the sprouts still have a little bite.

Serve the hot soup with rice and side dishes while the sprouts still have a little bite.

A Few Tips

Let the sprouts stay at the center.

Too much garlic, sesame oil or dark soy sauce can overwhelm a small pot of this soup.Choose one base first, then taste after the sprouts have cooked before adding salty seasonings.Sesame oil is not needed in this clear version.

Keep the simmer steady.

A very weak simmer can make the cooking time unpredictable, while a hard rolling boil loses water quickly.Aim for steady bubbles with room below the rim.Use the same uncovered method throughout rather than repeatedly covering and uncovering the pot.

Use broth when you want more depth.

Water gives a simpler bowl, while light anchovy-kelp stock adds another layer of savory flavor.For stock packs, coins and powder, choose a flavor that suits the soup and follow the product’s own dilution instructions.The stock guide explains how these options work and how to measure the liquid.A beef-based powder can also be used, but it makes a beef-flavored variation rather than an anchovy-style broth.

Make a small spicy variation.

For a little heat, add ½ teaspoon of gochugaru or a few thin slices of fresh green chili during the final few minutes of cooking.The broth will no longer look as pale, which is expected.Keep the mild version as the starting point and adjust only the bowls that need extra heat.

Quick FAQ

Is this soup vegan?

Choose water or a confirmed plant-based stock, and check that the soup soy sauce contains no animal ingredients.An anchovy pack, seafood coin or beef seasoning makes a different, non-vegan version.If serving kimchi alongside a vegan meal, check that it also contains no fish sauce or salted seafood.

Can I use mung bean sprouts instead?

You can cook them in a similar light soup, but it will be a variation with a softer texture and a different flavor.For the result shown here, choose the large yellow-headed soybean sprouts.Do not add a handful of raw sprouts to the finished bowl as a garnish; cook the sprouts thoroughly.

Should I take off all the yellow heads?

No, leave the sound yellow soybean heads attached.They are part of the flavor and texture of this dish.Remove damaged or discolored pieces rather than stripping every sprout.

Can I prepare it ahead?

Yes, but the sprouts soften as the soup sits and is reheated.For the best texture, make a small pot and serve it soon after cooking.If preparing ahead, chill it promptly instead of leaving the saucepan on the stove.

Leftovers

Divide leftover soup into small, shallow containers and refrigerate within 2 hours of cooking, or within 1 hour if the surrounding temperature exceeds 32°C (90°F).Keep the refrigerator at 4°C (40°F) or below.Plan to use this soup within 2–3 days for texture; the sprouts will become softer over time.Do not leave a large pot on the counter waiting for it to cool completely.

Reheat the portion you need to at least 74°C (165°F), and bring the soup to a boil while stirring so it heats evenly.Taste again after reheating, since evaporation may concentrate the seasoning.Freezing is possible, but it is not the best choice when the texture of the sprouts is the main appeal.

More Korean Recipes

Browse the Taste Korea recipe collection for more ideas to serve with rice and soup.For a fuller meal, a small portion of Korean bulgogi makes a savory companion to the light broth.

• Bugeoguk (Korean Dried Pollock Soup)
• Sogogi Muguk (Korean Beef and Radish Soup)
• Janchi Guksu (Korean Warm Noodle Soup)

Food Handling References

• FDA: Selecting and Serving Produce Safely
• USDA: Leftovers and Food Safety.

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