Roughly dice the onion and sauté in oil, add the peeled carrots, rinse with cold water, add the lentils, pour in the soup and milk and add the paprika, cumin and coriander (carefully dosed first!).
Let the soup boil gently until the lentils are soft (approx. 15 minutes), puree with the blender, add lemon juice and, if you want, some whipped cream and season to taste.
Serve sprinkled with lemon pepper and chilli flakes as desired.