Peel and dice the carrots and kohlrabi. Cook the cubes in 1 liter of vegetable stock for about 15 minutes. Add the cream and puree. Add the curry and garlic (chopped or pressed) and simmer for another 10 minutes. If the soup is too thick, add a little more water. Season with salt, pepper and, if you like it spicy, cayenne pepper to taste. Roast sunflower or pumpkin seeds in the pan and sprinkle over the soup before serving.