Peel and finely chop the onion. Heat the fat in a saucepan. Sauté diced onion in it. Add paprika paste and flour and sweat. Pour stock through a sieve. Slowly add liquid and 3/4 litre water to the paprika puree and bring to the boil while stirring.
Season to taste with salt and pepper. Cut chicken into small pieces and add to the soup. Wash and finely chop the parsley. Pour soup into the plates. Place 1 teaspoon of crème fraîche in the middle of each plate and pull apart with a wooden skewer.
Sprinkle with parsley.