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Probiotic vegetable soup served with kefir, colourful vegetables
Healthy and refreshing vegetable soup with kefir

Creamy probiotic vegetable soup with kefir

Author: Flavelo
Recipes Vegetarian & Vegan Soups
The meeting of hot soups and soured dairy products isn't new, just think of classic thickening or summer fruit soups. However, in this recipe we use a technical twist: the kefir is not heat-treated, but added to the dish afterwards by tempering. With this method, we preserve the live cultures in the fermented drink and its fresh, fizzy character, creating an exciting contrast with the earthy sweetness of root vegetables. The result is a soup that is warming and refreshing at the same time, balancing textures between creamy and bite-sized.
🕒 Prep Time 20 mins
🍳 Cook Time 35 mins
⌛ Total Time 55 mins
🍽️ Servings 4 servings
🔥 Calories 310 kcal
🌍 Cuisine Modern

Ingredients

Equipment Needed

  • Large soup pot (at least 3 litres for comfortable stirring)
  • Sharp chef's knife (for precise, uniform dicing of vegetables)
  • Chopping board (stable surface for chopping)
  • Ladle (essential for tempering)

Allergen Information

⚠️ Milk
⚠️ Celery

Instructions

1 ✓

Prepare the vegetables: peel the carrots, celeriac, kohlrabi, and potatoes, then cut them into uniform approx. 1x1 cm cubes. Wash and thinly slice the leek.

Tip: Uniform size is not just aesthetics, but a guarantee that everything cooks at the same time. If the carrot is big and potato small, one stays hard, the other falls apart. (Heat transfer uniformity)
2 ✓

Heat the oil in the pot and throw in the leek. Sauté until translucent, then add the carrot, celeriac, and kohlrabi (not the potato yet). Fry them over medium heat for 4-5 minutes until you smell a sweet aroma and the edges of the vegetables catch slightly.

Tip: Frying in fat brings out and intensifies flavours that would remain hidden with simple boiling. (Aroma compounds dissolving in fat)
3 ✓

Add the diced potato to the vegetables, then pour in the stock. Season with salt and pepper. Simmer under a lid for approx. 20 minutes until all vegetables are soft (check with a fork).

Tip: Never boil the soup vigorously, as the agitation breaks the vegetables and the broth becomes cloudy. (Avoiding mechanical damage)
4 ✓

Remove the soup from the heat and let cool for at least 10-15 minutes until it cools to approx. 60 degrees (no longer burning, but hot). Take the kefir out of the fridge and place in a bowl.

Tip: Waiting is critical: if the liquid is too hot, the kefir curds immediately.
5 ✓

Perform tempering: ladle some warm soup into the kefir and stir until smooth. Repeat once more, then pour the warmed kefir mixture back into the pot and stir.

Tip: Gradual temperature increase prevents heat shock, so milk proteins don't seize, and the soup remains silky. (Controlling protein denaturation)
6 ✓

Finely chop the fresh dill, sprinkle on top of the finished soup, and serve immediately.

Tip: Always add fresh herbs at the end, as their essential oil content evaporates quickly under heat.

Recipe FAQ

Why did the kefir become lumpy in the soup?
The soup was likely too hot when you stirred it in. Sudden heat causes milk proteins to seize up. Always wait for the soup to cool a little, and use the tempering method.
Can I use Caucasian kefir?
Yes, absolutely! Caucasian-style kefirs are generally thicker and have a more robust flavour, which benefits the soup's consistency.
How long does it keep in the fridge?
After adding kefir, it's best consumed within 1-2 days, as live cultures may continue working and make the dish more sour.

Ingredients

  • 2 pcs Medium carrots
  • 1 small head Celeriac
  • 1 head Young kohlrabi
  • 1 stalk Leek
  • 3 pcs Medium potatoes (waxy variety)
  • 500 ml Full-fat kefir (cold)
  • 1 l Vegetable stock (or water)
  • 2 tbsp Olive oil
  • 1 tsp Salt
  • 1 pinch Ground black pepper
  • 1 bunch Fresh dill