Russian Cold Soup: Okroshka with Kvass and Fresh Herbs

Russian cold soup, usually called okroshka, is a chilled mix of potatoes, hard-boiled eggs, cucumber, radishes, and herbs served in tangy kvass. This version is vegetarian, crisp, and filling, with sour cream and mustard rounding out the broth; family recipes also use kefir or add cooked meat.

Ingredients

1 lb (450 g) waxy potatoes, such as Yukon Gold or red potatoes
4 large eggs
2 medium English cucumbers, about 12 oz (340 g) total
8 oz (225 g) fresh radishes, trimmed
4 scallions, about 2 oz (55 g), white and green parts
½ cup (15 g) fresh dill, finely chopped, plus extra for serving
6 cups (1.4 L) chilled, unsweetened kvass
½ cup (120 g) sour cream, plus more for serving
2 tsp (10 g) prepared mustard, preferably a sharp Russian-style mustard
1 tsp fine salt, plus more to taste
¼ tsp freshly ground black pepper, plus more to taste
1 tbsp (15 ml) lemon juice, optional, for extra brightness

Instructions

Cook the potatoes. Scrub the potatoes and place them whole in a saucepan. Cover with cold water by about 1 inch (2.5 cm), add a generous pinch of salt, and bring to a boil. Lower the heat to maintain a steady simmer and cook until a knife slides into the center with little resistance, about 18 to 25 minutes depending on their size. Drain and let them cool until easy to handle. Peel if you like, then refrigerate until completely cold, at least 1 hour. Chilling makes the potatoes easier to dice and helps them hold their shape in the soup.
Boil and cool the eggs. Put the eggs in a second saucepan and cover with cold water by about 1 inch (2.5 cm). Bring to a boil, cover, turn off the heat, and leave for 11 minutes. Drain and cool under cold running water, then peel. Cook whole boiled eggs until the yolk and white are firm. Refrigerate them until cold, at least 1 hour; they can chill alongside the potatoes.
Prepare the vegetables and herbs. Dice the cold potatoes into roughly ½-inch (1.25 cm) pieces. Cut the cucumbers into similar pieces; if the skin is especially thick or waxed, peel it first. Slice the radishes thinly, then cut them into small pieces if they are large. Finely chop the scallions and dill. Dice the peeled eggs, reserving a few slices for garnish if desired.
Mix the base. In a large bowl, whisk together the sour cream, mustard, salt, pepper, and 1 cup (240 ml) of the chilled kvass until smooth. This loosens the sour cream and helps it blend evenly rather than forming clumps in the finished soup.
Combine. Add the potatoes, eggs, cucumbers, radishes, scallions, and dill to the bowl. Fold gently with a large spoon so the potatoes and eggs keep their shape. Pour in the remaining kvass and stir just until everything is distributed. Taste a spoonful before adding more salt, since kvass varies in saltiness and tartness.
Chill and adjust. Cover and refrigerate the soup for 30 minutes so the flavors come together. Taste again, then add more salt, pepper, or the optional lemon juice if it needs a sharper finish. If the soup seems too thick, stir in cold kvass a little at a time; if it tastes too tart, add a spoonful of sour cream. Serve cold with extra dill and sour cream.

Tips

Choose the right kvass. Look for unsweetened or savory kvass. Some bottled versions are sweet, which can make the soup taste unexpectedly sugary. If the only available kvass is mildly sweet, begin with 4 cups (950 ml), taste the mixture, and add more only if it works for you.
Keep the pieces fairly even. Pieces around ½ inch (1.25 cm) make it easy to get potato, egg, and crunchy vegetables in each spoonful. Very small dice can turn soft potatoes into a mash as you stir; very large pieces make the soup awkward to eat.
Cool everything before mixing. Warm potatoes or eggs can make the soup lukewarm and soften the vegetables. Spread the cooked potatoes on a plate to release steam before refrigerating, and do not leave them at room temperature for an extended period.
Season in stages. Kvass brands differ, and cold foods can taste less seasoned than warm ones. Start with the listed salt, chill the soup, and make the final adjustment just before serving. Sharp mustard is useful, but add extra gradually so it does not overpower the dill.

Serving Suggestions

Serve okroshka in chilled bowls as a light lunch or as the opening course of a summer meal. Put extra sour cream, chopped dill, and mustard on the table so each person can adjust the bowl. A slice of dark rye bread is a natural companion, and boiled or roasted potatoes on the side make the meal more substantial without changing the soup itself.

For a more traditional table, keep the soup properly cold and bring the kvass to the table separately if you expect different preferences for brothiness. You can spoon the chopped ingredients into bowls first and pour over the kvass just before eating. This keeps leftovers from sitting in broth and lets the vegetables retain more of their fresh texture. A little freshly ground black pepper or a few extra radish slices make a simple garnish.

Variations

Use kefir instead of kvass. Kefir-based okroshka is a familiar alternative in many households and across the region. Replace the kvass with 5 cups (1.2 L) plain kefir and thin it with up to 1 cup (240 ml) cold water to reach the consistency you like. The result is creamy and tangier, with no bread-like, fermented flavor from kvass. Taste before adding lemon juice, since kefir is already tart.

Add cooked meat. For a heartier bowl, fold in 8 oz (225 g) finely diced, fully cooked beef, chicken, or bologna-style sausage. Keep cooked meat refrigerated until you are ready to use it, and return the assembled soup to the refrigerator promptly. The meat makes the soup more filling and shifts it from this vegetarian version toward a common family-style variation.

Make it without sour cream. Leave out the sour cream and whisk the mustard with a little kvass before adding the rest. The broth will be lighter and less creamy. Plain unsweetened yogurt can stand in for sour cream in the kvass version, although it is often tangier and may need a little extra kvass to thin it.

Change the crunchy vegetables. If radishes are unavailable, use a little extra cucumber and add finely diced celery for a different kind of crunch. Celery is not a traditional one-for-one flavor match, so start with ¼ cup (25 g). A small amount of finely chopped fresh parsley can supplement dill, but replacing all the dill changes the soup’s characteristic herbal aroma.

Storage and Reheating

Refrigerate the soup within 2 hours of making it, in a covered container at 40°F (4°C) or below. For best texture, plan to eat it within 1 to 2 days: the vegetables gradually soften and release water, and the herbs lose some of their freshness. As a general food-safety limit, refrigerated leftovers keep 3 to 4 days, but this cold soup is most appealing well before then. If you are preparing ahead, store the diced vegetables and eggs separately from the kvass-and-sour-cream mixture, then combine them shortly before serving.

Do not freeze okroshka. Potatoes can become grainy after thawing, while cucumber and radish lose their crispness; sour cream may also separate. This is a cold soup, so it is not reheated. Keep it chilled while serving, and return the bowl or container to the refrigerator rather than leaving it out for a long meal.

Frequently Asked Questions

What is Russian cold soup called?
It is commonly called okroshka. The name refers to a soup made from chopped ingredients, and recipes vary: kvass is a classic base, while kefir and other tangy dairy-based liquids are also used. The vegetables and herbs can vary by household and season.

What does kvass taste like?
Kvass is a fermented drink traditionally made from bread, with a lightly tangy, malty flavor. Savory kvass gives okroshka a distinctive broth that is different from a creamy dairy soup. Bottled products vary, so check the label and avoid a strongly sweet version if you want a savory result.

Can I make okroshka the day before?
Yes. Cook and chill the potatoes and eggs, chop the vegetables, and keep each component covered in the refrigerator. For the freshest texture, mix the ingredients with the kvass and sour cream no more than a few hours before serving. If already assembled, refrigerate it promptly and stir gently before serving.

Can I use warm potatoes or eggs?
It is better to wait until both are fully chilled. Warm ingredients can raise the temperature of the soup and make cucumber and radish less crisp. Cook them ahead, cool them promptly, and refrigerate them until cold before chopping and mixing.

Why is my okroshka too thick or too sour?
For a thick soup, add chilled kvass gradually until it reaches the consistency you prefer. If it is too sour, stir in sour cream a spoonful at a time; if it is too mild, add a little mustard, salt, or lemon juice. Make small adjustments and taste between each one, since the kvass itself may already be quite tart or salty.

Is okroshka always made with kvass?
No. Kvass is a well-known traditional base, but recipes differ, and kefir-based versions are also widely made. Choose kvass for a lighter, malty broth or kefir for a creamy, tangy one. Both work with the chopped vegetables, potatoes, eggs, and herbs in this recipe.

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