Hungarian Kohlrabi Soup with Paprika

Hungarian kohlrabi soup is a gently savory, vegetable-forward soup made with tender kohlrabi, sweet paprika, broth, and a creamy sour-cream finish. This version thickens the broth with a simple flour-and-butter roux, making a comforting bowl that works as a light meal or a first course; Hungarian households and regional recipes vary in their seasonings and thickeners.

Ingredients

2 pounds (900 g) kohlrabi, peeled and cut into ½-inch (1.25 cm) cubes; reserve a few clean, tender leaves if available
1 medium yellow onion, about 1 cup (150 g) finely chopped
1 medium carrot, about ½ cup (70 g) peeled and finely diced
1 garlic clove, finely chopped
3 tablespoons (42 g) unsalted butter
2 tablespoons (16 g) all-purpose flour
2 teaspoons (6 g) sweet Hungarian paprika
6 cups (1.4 L) low-sodium vegetable broth
1 bay leaf
¾ teaspoon (4.5 g) fine salt, plus more to taste
¼ teaspoon (0.5 g) freshly ground black pepper
½ cup (120 g) full-fat sour cream, brought close to room temperature
1 tablespoon (15 ml) fresh lemon juice
¼ cup (15 g) finely chopped flat-leaf parsley
2 tablespoons (30 ml) water, only if needed to loosen the sour cream

Instructions

Prepare the vegetables, 20 minutes. Trim the kohlrabi, reserving small, fresh leaves if you have them. Cut away the tough skin with a knife or a sturdy peeler until you reach the pale, crisp flesh, then cube it evenly so the pieces cook at the same rate. Finely chop the onion, dice the carrot, and chop the garlic. If using leaves, rinse them well and slice them thinly. Measure the remaining ingredients before you start cooking; paprika can turn bitter if it sits in hot fat unattended.
Soften the aromatics, 5 minutes. Melt the butter in a heavy soup pot over medium heat. Add the onion and carrot and cook, stirring often, until the onion is translucent and the carrot begins to soften, about 4½ minutes. Stir in the garlic for the final 30 seconds. Keep the vegetables pale rather than browning them; a gentle base lets the kohlrabi’s mild, lightly sweet flavor remain clear.
Make the paprika roux, 2 minutes. Sprinkle in the flour and stir continuously for 1 minute, coating the vegetables and cooking away the raw-flour taste without letting the mixture darken. Lower the heat, add the sweet paprika, and stir for about 30 seconds. Slowly pour in a ladleful of broth while stirring to form a smooth paste, then gradually whisk in the rest of the broth. Scrape the bottom and corners of the pot so no flour is left in lumps.
Simmer until tender, 20 minutes. Add the cubed kohlrabi, bay leaf, salt, and black pepper. Bring the soup just to a boil, then reduce the heat so it simmers gently with the lid slightly ajar. Cook for about 20 minutes, stirring once or twice, until a fork slides into a kohlrabi cube without resistance. If the cubes are unusually large or mature, they may need a few extra minutes; use tenderness rather than the clock as the final guide.
Temper the sour cream and finish, 5 minutes. Remove the bay leaf. In a small bowl, stir the sour cream until smooth. Whisk in a spoonful of hot broth, then another, to warm it gradually; add a little of the measured water if the sour cream is too thick to whisk smoothly. Take the soup off the heat and stir in the tempered sour cream, lemon juice, parsley, and any sliced kohlrabi leaves. Return the pot to low heat for about 5 minutes, stirring gently until hot but not boiling. Taste and adjust the salt, pepper, or lemon. Serve while warm.

Tips

Choose kohlrabi that feels heavy for its size. Smaller bulbs are often more tender, but large ones work if you peel them thoroughly. The outer skin and the fibrous layer just underneath can stay tough after simmering, so trim them away rather than relying on longer cooking to soften them.
Use sweet paprika, not smoked or hot paprika, for the familiar flavor. Hungarian sweet paprika is widely available in grocery stores and is the best fit here. If you only have regular sweet paprika, use the same amount; smoked paprika will give the broth a noticeably smoky taste, while hot paprika makes it spicier.
Keep the roux and dairy gentle. Stir the flour into the butter before adding liquid, and whisk in the broth gradually to prevent lumps. Tempering the sour cream helps it blend into the soup. Once it is added, avoid a hard boil, which can make the dairy look grainy or separated.
Adjust thickness at the end. This recipe makes a lightly thickened soup, not a dense purée. If it seems too thick, stir in a splash of broth or water. If you want it thicker, mash a few cooked kohlrabi cubes against the side of the pot and stir them back in instead of adding extra flour.

Serving Suggestions

Serve the soup hot in shallow bowls, with a little extra chopped parsley and a small spoonful of sour cream if you like. Crusty bread, rye bread, or simple dinner rolls are useful for soaking up the paprika-scented broth. For a more substantial lunch, pair a bowl with an open-faced cheese sandwich, a hard-boiled egg, or a crisp green salad dressed with a tart vinaigrette.

The soup is satisfying as a first course before a meal of roasted vegetables, pork, or chicken, but it can also stand on its own when served with bread and a salad. Keep any garnish separate until serving so herbs stay fresh and sour cream does not disappear into the pot. A squeeze of lemon at the table is welcome if the broth tastes especially rich or mild.

Variations

For a dairy-free pot, replace the butter with olive oil and use an unsweetened, plain oat or soy cream in place of sour cream. The result will be less tangy and may have a slightly different texture, so add lemon gradually and taste as you go. For a gluten-free version, use a cup-for-cup gluten-free flour blend for the roux; check that the blend is suitable for thickening hot liquids, and whisk the broth in especially slowly.

To make the soup more filling, add 1 cup (150 g) of peeled, diced potato along with the kohlrabi and simmer until both vegetables are tender. The potato gives the broth a softer, starchier body. You can also replace up to 2 cups (475 ml) of the vegetable broth with chicken broth for a deeper savory flavor. For a little heat, add a pinch of hot Hungarian paprika alongside the sweet paprika, rather than substituting all of it.

If you prefer a smoother soup, remove the bay leaf and blend only a portion of the cooked vegetables with some broth, then stir that mixture back into the pot before adding the sour cream. Blending the whole pot is also possible, but it changes the traditional chunky texture and can make the soup seem thicker. Keep a few cubes intact if you want a contrast between creamy broth and tender pieces.

Storage and Reheating

Cool leftovers promptly and refrigerate them within 2 hours of cooking, preferably in shallow, covered containers. The soup keeps for 3 to 4 days in the refrigerator. The sour-cream broth may thicken as it chills; that is normal. If it separates slightly, stir it well as it warms rather than trying to fix it while cold.

Reheat only the portion you plan to eat in a saucepan over low to medium-low heat, stirring often and adding a splash of broth or water if needed. USDA FSIS guidance is to reheat leftovers to 165°F (74°C); check the center with a food thermometer. Avoid boiling the soup, since vigorous heat can make the sour cream separate. A microwave also works: heat in short intervals, stir between them, and check the temperature in more than one spot. Freeze leftovers in an airtight container for up to 2 months for best quality, though the creamy texture may be less smooth after thawing. Thaw overnight in the refrigerator and reheat gently.

Frequently Asked Questions

What does kohlrabi taste like?
Kohlrabi has a mild, fresh flavor often compared with a mix of cabbage stem and broccoli stem, with a gentle sweetness when cooked. In this soup it stays pleasantly firm if cut into even cubes and simmered only until tender. It is not strongly cabbage-like, so the paprika, parsley, and sour cream remain easy to taste.

Can I make Hungarian kohlrabi soup without sour cream?
Yes. Leave it out for a lighter, brothier soup, or use plain unsweetened plant-based cream for a dairy-free option. Without sour cream, the soup will be less tangy and less creamy, so taste it before serving and add lemon a little at a time. Avoid sweetened or flavored alternatives, which can make the broth taste out of place.

Can I prepare the soup ahead?
Yes. You can make the soup through the simmering step, cool and refrigerate it, then reheat it gently and add the tempered sour cream, lemon, and parsley shortly before serving. This approach keeps the herbs brighter and gives you more control over the creamy finish. If the soup is already fully finished, it still reheats well when warmed slowly without boiling.

Do I have to peel kohlrabi?
Yes, peel away the firm outer layer, especially on mature or large bulbs. A vegetable peeler may work on small, tender kohlrabi, but a paring knife is often easier for thick or woody skin. Keep peeling until the surface looks pale and feels crisp; leaving fibrous skin on can give the finished soup unpleasant chewy pieces.

Can I use kohlrabi leaves?
Yes, if they are fresh, tender, and in good condition. Wash them carefully, remove any tough stems, and slice the leaves thinly before stirring them into the soup during the final few minutes. They add a mild green, leafy flavor. If the leaves are wilted, yellow, or especially tough, leave them out and finish with parsley instead.

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