Cook lentils, depending on the variety, in water until soft.
Mix the ingredients for the marinade.
Clean and wash lamb’s lettuce.
Peel beet and cut into cubes.
Peel grapefruit with a kitchen knife. Cut away the white skin. Fillet grapefruit.
Peel avocado, cut in half, remove pit, slice halves.
Arrange all salad ingredients on plates, drizzle sauce over.