Thoroughly wash and dice the Jerusalem artichoke, carrots and sweet potatoes. Peel if necessary, if not organic.
Heat 1 - 4 tablespoons of oil in a saucepan and sweat the diced vegetables in it. Deglaze with 1 liter of vegetable stock and simmer for 10-15 minutes.
Then take the pot off the stove. Add brown sugar and curry powder and season with lemon juice, coriander, thyme, salt and cayenne pepper. Then puree everything well.
Finally, add 1 - 2 tablespoons of sour cream - I also like to use low-fat cream cheese, if we don`t have anything else. If necessary, puree again briefly and enjoy the soup warm or cold.