Korean Daikon Soup: A Clear, Savory Radish Broth Recipe

Korean daikon soup, often called mu-guk when made with Korean radish, is a clear, gently savory soup of tender radish and beef in a light broth. This version uses daikon, thin-sliced beef, and a simple kelp-and-shiitake stock; it is served hot with rice, and Korean households make many variations with different broths and seasonings.

Ingredients

8 cups (1.9 L) water
1 piece dried kelp, about 3 by 4 inches (8 by 10 cm; about 5 g)
2 dried shiitake mushrooms (about 12 g)
12 oz (340 g) beef sirloin or brisket, cut across the grain into thin strips about 1/4 inch (6 mm) thick
1 1/2 lb (680 g) Korean radish (mu) or daikon, peeled and cut into bite-size rectangles about 1/4 inch (6 mm) thick
1 tablespoon (15 ml) toasted sesame oil
3 garlic cloves (about 9 g), finely minced
2 tablespoons (30 ml) Korean soup soy sauce (guk-ganjang)
1/2 teaspoon fine salt (about 3 g), plus more to taste
1/4 teaspoon ground black pepper (about 0.5 g)
2 green onions (about 30 g), thinly sliced

Instructions

Prepare the ingredients. Peel the radish and cut it into evenly sized, thin pieces so it cooks at a similar rate. Slice the beef across the grain, which shortens the muscle fibers and makes the pieces easier to eat. Mince the garlic and slice the green onions, keeping the white and green parts together or separate as you prefer. Set out a fine-mesh strainer and a clean bowl for the stock.
Make the quick kelp-shiitake stock. Put the water, dried kelp, and dried shiitake mushrooms in a medium saucepan. Bring the water just to a boil over medium-high heat, then lower the heat and simmer gently for 15 minutes. Lift out the kelp after about 10 minutes if you prefer a milder, less briny stock; leaving it in for the full time gives a deeper seaweed flavor. Strain the stock into a heatproof bowl and reserve the mushrooms. Discard the kelp, remove and discard the mushroom stems, and thinly slice the caps. This stock is meant to be delicate rather than intensely flavored; the radish and beef will season it as the soup cooks.
Season and sear the beef. Heat the sesame oil in a clean soup pot over medium heat. Add the beef in a loose layer, working in two batches if the pot is crowded. Cook for about 2 minutes, stirring once or twice, just until the outside loses its raw color; browning is not essential, and hard searing can make the broth darker. Stir in the garlic and cook for 30 seconds, until fragrant. Add the sliced radish and cook for 4 minutes, stirring so it is coated with the oil and beef juices.
Simmer the radish. Pour the reserved stock into the pot. Stir in the soup soy sauce, salt, and black pepper, then bring the liquid to a gentle boil. Reduce the heat to maintain a steady simmer, partly cover the pot, and cook for 20 minutes. Stir once or twice. The radish should look slightly translucent at the edges and yield easily when pierced, but it should still hold its shape. Add a splash of water if the liquid reduces more than expected.
Finish cooking the beef and adjust. Stir in the sliced shiitake caps and simmer for 5 minutes, until the beef is cooked through. Check the thickest beef strip with a food thermometer; USDA FSIS gives 145°F (63°C) plus a 3-minute rest as the safe minimum for whole cuts of beef. Remove a checked strip to a clean plate for the 3-minute rest, then return it to the soup. Thin strips cook quickly, so avoid boiling the soup hard or leaving the beef simmering long after it is done. Taste the broth and add salt a small pinch at a time if needed. Stir in the green onions and serve hot.

Tips

Choose the right radish. Korean radish is usually shorter and rounder than daikon, with a crisp texture and a pleasantly sweet, peppery flavor. Daikon is a practical substitute and works well here, though it can be milder and release a little more water. Cut whichever you use into pieces of similar thickness.
Use soup soy sauce if you can find it. Guk-ganjang has a lighter color and more pronounced salty, fermented flavor than standard soy sauce, so it seasons clear soup without turning it dark. If it is unavailable, replace it with 1 tablespoon (15 ml) regular soy sauce and begin with less salt; the broth will be darker and may taste slightly sweeter.
Keep the broth at a gentle simmer. A rolling boil can break up the radish and make the soup cloudy. Thin beef also turns tough if it is cooked vigorously for too long. If your stovetop runs hot, lower the flame until only small bubbles rise around the edge of the pot.
Season near the end. Soup soy sauce and beef both add saltiness, and the broth concentrates as it simmers. Start with the listed salt, taste after the beef is cooked, and adjust before serving rather than adding a large amount early.

Serving Suggestions

Serve the soup in warm bowls with steamed short-grain rice. A typical meal might include a bowl of rice, this soup, and a few small side dishes such as kimchi, seasoned spinach, or lightly dressed bean sprouts. The broth is mild enough to balance punchier, salty sides, while the radish makes each spoonful substantial without making the soup heavy.

For a simple table, offer extra sliced green onion, black pepper, and a small dish of kimchi so everyone can season their own bowl. If serving a larger meal, use the soup as a first course in modest portions or as the warm centerpiece alongside rice and vegetables. Spoon both broth and radish into each bowl, then make sure each serving gets some beef and shiitake. The soup is best served freshly hot, but it does not need elaborate garnishes.

Variations

Make it with anchovy broth: For a familiar non-beef variation, simmer dried Korean anchovies with the kelp instead of shiitake, then strain them out. Follow the package guidance for the anchovies and remove their heads and guts first if they have not already been cleaned. This produces a more distinctly savory, seafood-flavored broth; omit the beef and sesame-oil sauté, and simmer the radish in the strained stock until tender. As with any cooked seafood ingredient, heat it thoroughly; the broth should be brought to a simmer.

Use a beef-only stock: If you want a more pronounced beef flavor, simmer the soup with a piece of beef brisket or another suitable soup cut, then slice or shred it before serving. This takes longer than the quick-stock method, and the cooking time will depend on the cut; simmer until tender and follow the same safe-temperature guidance for whole cuts of beef. Keep the radish pieces large enough to withstand the longer simmer, or add them later so they do not fall apart.

Make a meatless bowl: Leave out the beef and use the kelp-shiitake stock as the base. Add an extra dried shiitake or two for more savory depth, and consider adding a little more soup soy sauce after tasting. It will be lighter and less rich than the beef version, but the radish and mushrooms still make a satisfying clear soup.

Add gentle heat: Stir a small pinch of Korean red pepper flakes (gochugaru) into the pot with the garlic, or serve the flakes at the table. This adds warmth and color without changing the soup into a strongly spicy stew. Add gradually because heat varies among brands and batches.

Storage and Reheating

Cool leftovers promptly and refrigerate them within 2 hours of cooking, in a covered container. The soup keeps for 3 to 4 days in the refrigerator. The radish softens more as it sits, and the broth may taste a little more seasoned the next day, so check the salt before serving again. For longer storage, freeze portions in airtight freezer-safe containers for up to 2 months for best quality; leave a little room for expansion. Thaw in the refrigerator overnight.

Reheat only the portion you plan to eat in a saucepan over medium heat, stirring occasionally, until it is steaming throughout. USDA FSIS recommends reheating leftovers to 165°F (74°C); check the center of the soup with a food thermometer. Avoid repeatedly cooling and reheating the full pot, since that can reduce quality and make safe handling harder. Add a splash of water if the broth has concentrated, then adjust seasoning after it is hot.

Frequently Asked Questions

Is Korean radish the same as daikon?
Korean radish and daikon are related types of white radish, but they are not identical. Korean radish is often shorter, rounder, and denser, while daikon is commonly longer and milder. Daikon works well in this soup; cut it evenly and taste the broth before adding extra salt because its flavor can be gentler.

Can I use regular soy sauce instead of guk-ganjang?
Yes. Use about 1 tablespoon (15 ml) regular soy sauce in place of the 2 tablespoons of soup soy sauce, then add more only after tasting. Regular soy sauce is darker and can make the broth seem less clear, and its sweetness and saltiness vary. A little additional salt can make up for the smaller amount without over-seasoning the soup.

Why is my soup cloudy?
A hard boil, heavy stirring, or a strongly browned beef sear can cloud a clear broth. Keep the soup at a gentle simmer and stir only as needed. A little cloudiness does not make it unsafe or change the basic flavor, but straining the stock and avoiding vigorous boiling help keep the finished soup clearer.

Can I make it ahead?
Yes. Make the soup up to 3 days ahead, cool it promptly, and refrigerate it covered. The radish will soften and the flavors will meld, so it may be especially convenient for a make-ahead meal. Reheat the amount you need to 165°F (74°C), then taste and adjust the salt. If you want firmer radish, prepare the stock ahead but cook the radish and beef closer to serving time.

Can I make this soup without beef?
Yes. Omit the beef and use the meatless variation with the kelp-shiitake stock, or make an anchovy-based broth if you eat fish. A meatless version will have a lighter body, so add an extra mushroom or season with a little more soup soy sauce after tasting. Serve with rice and vegetable side dishes for a complete meal.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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