A large serving or two smaller servings.

soup:
1.5 cups cold vegetable stock
1 avocado
1/4 cucumber
2 tablespoons sour cream
salt and pepper

topping:
1/2 cup pumpkin seeds
basil
1/2 teaspoon olive oil
feta cheese

Mix all the ingredients for the soup, pour it into a bowl. Chop the basil and pumpkin seeds, mix with olive oil, sprinkle the mixture on the soup and top with feta cheese.