Serbian Zucchini Soup with Dill and Sour Cream

Serbian zucchini soup is a gentle, creamy vegetable soup made with zucchini, potato, broth, dill, and sour cream. This home-style version is filling without being heavy, and Serbian family recipes vary in how much they blend the vegetables or finish the soup.

Ingredients

2 tablespoons (30 ml) neutral oil or sunflower oil
1 medium yellow onion, finely diced, about 1 cup (150 g)
1 medium carrot, peeled and diced, about ¾ cup (100 g)
2 garlic cloves, minced, about 2 teaspoons (6 g)
2 tablespoons (16 g) all-purpose flour
6 cups (1.4 L) vegetable or chicken broth, preferably low-sodium
1 medium Yukon Gold or other waxy potato, peeled and diced, about 1 cup (180 g)
2 pounds (900 g) zucchini, trimmed and cut into ½-inch (1.25 cm) pieces
1 teaspoon (6 g) fine salt, plus more to taste
¼ teaspoon (0.5 g) freshly ground black pepper
¾ cup (180 g) full-fat sour cream, divided
¼ cup (10 g) finely chopped fresh dill, divided
1 tablespoon (15 ml) lemon juice
½ cup (120 ml) water or extra broth, only if needed to thin the finished soup

Instructions

Set out and prepare the vegetables before heating the pot. Cut the zucchini into pieces of similar size so they soften evenly, and dice the potato a little smaller than the zucchini because it takes longer to become tender. Keep the broth nearby; adding it after the flour helps make a smooth base.
Heat the oil in a large, heavy pot or Dutch oven over medium heat for about 1 minute. Add the onion and carrot and cook for 7 minutes, stirring now and then. The onion should turn soft and translucent, while the carrot begins to soften. Lower the heat if the onion starts to brown; a lightly cooked vegetable base gives the soup a mild, clean flavor.
Stir in the garlic and cook for 30 seconds, just until fragrant. Sprinkle the flour over the vegetables and stir continuously for 1 minute so it coats them and loses its raw, dusty smell. Do not let it darken. Pour in about 1 cup (240 ml) of broth a little at a time while stirring, scraping the bottom of the pot and smoothing out any small flour lumps. Add the remaining broth, potato, salt, and pepper.
Bring the broth to a gentle boil, then lower the heat to maintain a steady simmer. Cook uncovered for 10 minutes, stirring once or twice. The potato should be starting to turn tender but should not yet be falling apart. A strong rolling boil is unnecessary and can make the vegetables break up before they cook evenly.
Add the zucchini and simmer for 10 minutes, stirring occasionally, until both the zucchini and potato are easily pierced with the tip of a knife. If the zucchini pieces are especially small, check them after 8 minutes; if they are larger, they may need a couple of extra minutes. Avoid prolonged simmering, which can make zucchini watery and dull in color.
Take the pot off the heat. For a mostly smooth soup, blend it with an immersion blender until creamy, keeping the blender head submerged to prevent splashes. For more texture, blend only about half of the soup, or mash some of the potato and zucchini against the side of the pot with a wooden spoon. A countertop blender works too, but blend in batches and vent the lid according to its instructions because hot liquid expands.
In a small bowl, whisk the sour cream until smooth. Stir in a ladleful of hot soup, then whisk in a second ladleful. This gradual warming, or tempering, helps the sour cream mix into the pot without forming little cold clumps. Stir the warmed mixture back into the soup along with 3 tablespoons (about 8 g) of the dill. Keep the soup over low heat for 2 minutes, stirring gently; do not let it boil after adding the sour cream.
Stir in the lemon juice and taste. Add more salt or pepper if needed, and loosen the soup with up to ½ cup (120 ml) water or broth if it is thicker than you like. Serve hot with the remaining 1 tablespoon (about 2 g) dill and a small spoonful of the reserved sour cream. The finished soup should be creamy but still pour easily from a ladle.

Tips

Choose zucchini that feels firm. Medium zucchini are easy to chop and tend to have fewer large seeds than very oversized ones. If using large garden zucchini, scoop out a spongy, seed-filled center before dicing; it can otherwise add excess water and a seedy texture.
Keep the flour pale. The brief flour-and-vegetable step thickens the broth without making a roux-heavy soup. Stir constantly and add the first cup of broth gradually. If you prefer a gluten-free soup, omit the flour and blend a little more potato into the broth; the result will be slightly less velvety but still pleasantly thick.
Temper the sour cream and avoid boiling afterward. Cold sour cream added straight into a hot pot can separate or look grainy. Warming it with ladles of soup first and holding the pot at a gentle heat helps it stay smooth. Full-fat sour cream is more stable than low-fat versions.
Adjust thickness after blending. The amount of liquid in zucchini varies, and a fully blended soup can seem thicker as it stands. Add broth or water a splash at a time rather than adding a large amount at once. Taste again after thinning, since extra liquid also softens the seasoning.

Serving Suggestions

Serve the soup in warm bowls with crusty bread, a soft roll, or toasted rye bread for dipping. A simple green salad or sliced tomatoes and cucumbers make a fresh side, especially when the soup is served as a light lunch. For a more substantial meal, offer boiled potatoes, grilled vegetables, or a cheese-and-bread plate alongside it.

Finish each bowl with fresh dill, a small swirl of sour cream, and black pepper. A few drops of lemon juice brighten the mild zucchini flavor, but add it at the table if some diners prefer a softer, less tangy taste. The soup is also good warm rather than piping hot, when the dill aroma is easy to notice and the creamy texture remains appealing.

Variations

Make it dairy-free: Leave out the sour cream and use vegetable broth. Blend the soup thoroughly for a creamy texture, then finish with a little extra lemon juice. For a richer dairy-free finish, stir in ¼ cup (60 ml) plain, unsweetened oat cream or cashew cream; the flavor will be less tangy than with sour cream.

Add a little paprika: Stir ½ teaspoon (1 g) sweet paprika into the cooked onion and carrot just before adding the garlic. It adds gentle warmth and color, not heat. Avoid scorching the paprika; a few seconds in the oil is enough before adding the flour and broth.

Keep some vegetables whole: Skip the blender and serve the soup as a brothy vegetable version, or mash only a small portion to give the broth body. You can also add ½ cup (75 g) frozen peas during the last 3 minutes of simmering for a sweeter, more colorful bowl. Fresh parsley can replace some or all of the dill, although the flavor will be less distinctly herbal.

Use yogurt carefully: Plain full-fat Greek yogurt can stand in for sour cream, but it is more likely to split if boiled. Temper it as directed, stir it in off the heat, and serve promptly. For a more traditional, tangy dairy finish, sour cream is the better choice.

Storage and Reheating

Cool leftovers promptly and refrigerate them within 2 hours of cooking, ideally in shallow, covered containers so they chill evenly. The soup keeps for 3 to 4 days in the refrigerator. Because it contains sour cream, its texture may become a little less smooth after chilling; stir it well before reheating.

Reheat only the amount you plan to serve in a saucepan over low to medium-low heat, stirring frequently and stopping when it is steaming hot. Do not let it boil, as the sour cream may separate. For food safety, reheated leftovers should reach 165°F (74°C); check the center with a food thermometer. Add a splash of broth or water if the soup has thickened, then taste and adjust the salt and lemon.

Freezing is possible, but the sour cream can turn grainy after thawing. For the best texture, freeze the soup before adding sour cream and dill, leaving a little space in a freezer-safe container. Thaw it overnight in the refrigerator, bring it to a simmer, then temper in fresh sour cream and add fresh dill. Use frozen soup within about 2 months for best quality.

Frequently Asked Questions

Is this soup traditionally Serbian?

Zucchini soups and creamy vegetable soups appear in many parts of the Balkans, and home recipes differ from one household to another. This version uses ingredients and a sour-cream-and-dill finish familiar in the region, but it is not presented as the sole or definitive Serbian preparation. Some cooks leave the vegetables chunky, while others blend the soup smooth.

Can I make Serbian zucchini soup without a blender?

Yes. Dice the vegetables evenly and cook them until very tender, then mash some of the potato and zucchini against the pot with a spoon or potato masher. The soup will be more rustic and less uniformly creamy, but the potato and flour still give the broth body.

Can I make the soup ahead?

Yes. Cook the soup through the blending step, cool and refrigerate it, then reheat gently when you are ready to serve. Stir in the tempered sour cream, dill, and lemon juice near the end. You can also make the complete recipe a day ahead; expect a slightly thicker texture and loosen it with broth as needed.

Why did my sour cream separate?

The soup may have been boiling when the sour cream went in, or the cream may have been added cold in one pour. Take the pot off the heat, whisk the sour cream smooth, and temper it with hot soup before stirring it in. If it has already separated, blending briefly may improve the appearance, though the texture might not become perfectly smooth.

Can I use yellow summer squash instead of zucchini?

Yes. Replace the zucchini with the same weight of yellow summer squash and use the same cooking time, checking for tenderness before blending. The flavor and texture are close, although yellow squash may give the soup a slightly sweeter taste. Avoid watery, oversized squash with a soft center.

What broth works best?

Low-sodium vegetable broth keeps the soup vegetarian and lets the dill and zucchini stand out. Chicken broth makes it a little richer. If your broth is already salty, begin with less added salt and season at the end, after the soup has been blended and finished with sour cream.

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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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