Cucumber Kefir Soup: Cold, Creamy, and No Cooking Required
Cucumber kefir soup is a cold, no-cook soup made by blending cucumbers, avocado, milk kefir, Greek yogurt, fresh dill, shallot, lime juice, and a little cumin until smooth. It takes 10 minutes in a blender or food processor, then chills in the fridge until you are ready to eat. The kefir makes it tangy and creamy at the same time; the avocado gives it body without any cream, and the whole thing tastes like the cold cucumber soup version of a really good tzatziki. If your kitchen is too hot to cook in, this is dinner.
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I make this on the hot days when I really do not want to cook. It has become my favorite way to use up homemade milk kefir when the jar gets ahead of us, and it is one of the fastest no-cook dinners I make: everything goes in the blender, and the fridge does the rest.
Why You Will Love This Recipe
- It is a true no-cook recipe. No stove, no oven, no waiting for anything to cool down. Ten minutes of prep and the blender does all the work.
- Kefir does two jobs at once. It brings the creaminess of a dairy base and the tang you would normally add with vinegar or extra citrus, so the flavor tastes finished with very few ingredients.
- Avocado makes it creamy without cream. The texture lands somewhere between a chilled soup and a smoothie bowl, thick enough to hold its garnish.
- It is a make-ahead friendly cucumber avocado soup. It actually tastes better after an hour in the fridge, which makes it an easy starter for guests or a ready-when-you-are lunch.
Ingredients
- Milk kefir: the backbone of the soup, giving it both the creaminess and the tang. Plain, unsweetened kefir is what you want; store bought works exactly the same as homemade. Buttermilk should work if it is what you have on hand, though the soup will be a little thinner and less tangy.
- Avocado: thickens the whole batch so you get a creamy soup without any cream. Use one that gives slightly when pressed.
- English cucumbers: they blend the smoothest, and their thin skin and small seeds keep the soup from tasting bitter or watery.
- Fresh dill: the signature flavor here. Dried dill will not give you the same fresh taste, so save it for another recipe. Fresh mint or basil can stand in for the dill and takes the soup in a completely different direction.
A few other easy swaps: sour cream in place of the Greek yogurt for a richer bowl, lemon juice evenly for the lime, and a thin slice of red onion for the shallot if you keep it small. I have not tested every combination in this exact recipe, so treat the swaps as starting points.
See the recipe card for the complete list of ingredients and quantities.
How to Make Cucumber Kefir Soup
This is the entire method: everything goes into a blender or food processor, and you blend. That is what makes it one of the easiest cold soup recipes you can keep in rotation all summer.
Step 1: Load the blender. Add the chopped cucumbers, avocado, kefir, Greek yogurt, vegetable broth, shallot, dill, lime juice, cumin, salt, and pepper.
Step 2: Blend until smooth. Run for 45 to 60 seconds, scrape down the sides, and pulse again until the soup is creamy with fine green flecks of dill throughout. Taste it, then adjust the salt and lime.
Step 3: Chill and serve. An hour in the fridge lets the flavors settle in and gets the soup properly cold. Ladle into bowls and finish with thin cucumber slices, a sprig of dill, a drizzle of olive oil, and a crack of black pepper.
My Testing Notes
I found that using kefir with a smaller amount of Greek yogurt gives the soup a creamy texture without making it too thick. Too much kefir made it thinner than I wanted. I prefer peeling the cucumber for this recipe, especially when the skin is thick or slightly bitter.
The soup tastes best after chilling for at least 1 hour, which gives it time to get properly cold and lets the flavors come together. I usually make it the same day I plan to serve it and keep it refrigerated until serving. This is more of an adults' favorite in my house than one my kids reach for.
Serving Suggestions
This soup is thick and cool, so it works best with something crunchy on the side. Crusty bread is what I reach for most. Like a lot of summer soups, it is happiest as part of a bigger spread, so here are a few things that pair well:
- Pair it with a crisp spicy Korean cucumber salad for contrast.
- Serve it alongside an avocado salad with tomato to stay in the same creamy, fresh direction.
- Set it next to these gazpacho shots with microgreens for a cold-soup spread, one tomato-based and one green.
- Finish with these strawberry kefir popsicles, the dessert answer to the same too-much-kefir problem.
Recipe FAQs
Yes, and it improves with an hour of chilling. It keeps in an airtight container in the fridge for up to 24 hours. The avocado is protected by the lime juice and kefir, so the color holds well for a day; give it a good stir before serving because it can settle slightly.
Cool, tangy, and creamy, closest to a drinkable tzatziki or a cold cucumber soup with yogurt and dill, but with a rounder, slightly effervescent tang from the kefir. It is savory, not sweet, and the cumin adds a quiet warmth underneath the fresh cucumber flavor.
I prefer peeling the cucumber for this recipe, especially when the skin is thick or slightly bitter. Peeling also gives you the smoothest, palest green soup. Thin-skinned English cucumbers can be left unpeeled if you do not mind a deeper green color and a bit more texture.
No. Kefir and yogurt separate when frozen and thawed, and the texture never comes back together properly. This is a make-it-and-eat-it-within-a-day recipe.
Usually the cucumbers. Larger, seedier cucumbers carry more water. Next time, scoop the seeds out of very large cucumbers before blending, or thicken the finished batch with an extra spoonful of Greek yogurt.
If you tried this Kefir Cucumber Soup Recipe or any other recipe on my website, please leave a 🌟 star rating and let me know how it went in the 📝 comments below.
Equipment
- Food processor or blender
- Airtight glass storage containers
Ingredients
- 2 large English cucumbers about 1½ pounds, peeled and roughly chopped
- 1 ripe avocado pitted and quartered
- 1½ cups plain milk kefir
- ½ cup Greek yogurt
- 1 small shallot peeled and halved
- ¼ cup fresh dill lightly packed, plus more for garnish
- 2 tablespoons fresh lime juice about 1 lime
- ½ cup vegetable broth
- ½ teaspoon ground cumin
- ¾ teaspoon fine sea salt plus more to taste
- ¼ teaspoon ground black pepper
- Extra virgin olive oil for drizzling
Instructions
- Add the cucumbers, avocado, kefir, Greek yogurt, vegetable broth, shallot, dill, lime juice, cumin, salt, and pepper to a blender or food processor.
- Blend for 45 to 60 seconds. Scrape down the sides, then blend again until the soup is smooth and creamy with fine flecks of dill throughout. Taste and adjust with additional salt or lime juice if needed.
- Refrigerate for at least 1 hour for the best flavor and temperature. If serving immediately, start with thoroughly chilled kefir and cucumbers.
- Divide the soup between serving bowls. Garnish with thin cucumber slices, fresh dill, a drizzle of olive oil, and freshly cracked black pepper before serving.
Notes
- Store leftovers in an airtight container in the refrigerator for up to 24 hours. Stir well before serving, as slight separation is normal.
- Do not freeze. The kefir and yogurt will separate after thawing.
- If using large cucumbers with mature seeds, scoop out the seeds before blending to keep the soup thick and creamy.
- For an even colder soup, chill the serving bowls for 15 to 20 minutes before serving.