Soak lentils in approx. 3/4 l water for at least 3 hours. Drip off, catch the soaking water. Put 3 tablespoons of lentils aside. Blend the rest of the lentils in the universal chopper or with the cutting stick
Peel and chop onion and garlic. Mix flour and baking powder. Add everything and knead until smooth. Add some soaking water if necessary. Knead in the rest of the lentils. Season with salt, chilli, coriander and cumin. Chill for about 30 minutes.
Mix vinegar, salt, pepper and sugar. Whip 2-3 tablespoons of oil into it. Peel cucumber, wash tomatoes. Remove seeds and dice both. Wash parsley and chop finely. Mix everything with the marinade. Wash mint and chop finely. Mix with yoghurt. Season to taste with salt and pepper.
Form approx. 24 walnut-sized balls from the lentil dough with moistened hands. Fry in 6 tablespoons of hot oil all around for about 10 minutes. Drain well. If necessary, heat up flat bread and fold it so that a pocket is formed. Pour in salad, falafel and yoghurt sauce