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Begin by cutting the end off the leek and then cut the leek in half lengthwise. Chop the leek into small pieces; this makes the leek easier to wash as they are notoriously dirty. Wash the leeks very well in cool water and rinse several times.
Once the leeks are washed, preheat a large saucepan over medium-high heat. Add in the butter and allow to melt, then swirl the pan to coat it. Add in the chopped leeks and onions. Cook for 3-4 minutes or until translucent.
Add in the water and cauliflower florets. Cook for 10-12 minutes at a simmer until the cauliflower is tender.
Place ½ of the mixture into a high-powered blender and puree until smooth. Pour the soup into another bowl and repeat with the remaining soup.
Combine the soup and place it all back into the saucepan and add the cream and sour cream. Use a whisk if necessary to smooth the sour cream. Chill and serve when the soup is around room temperature.