Wash the meat and dab dry with kitchen paper. Cut into thin slices with a sharp knife. Put 1-2 meat strips on a wooden skewer. Peel onion and dice very finely.
Peel garlic and chop very finely. Clean, wash and halve the tomatoes. Clean, wash and cut the rocket into fine strips. Heat 1 tablespoon of oil in a saucepan, fry the onion and half of the garlic in it.
Add bulgur, pour in broth, bring to the boil and allow to swell at low heat for about 15 minutes. 3-4 minutes before the end of the cooking time, fold in tomatoes and rocket and add butter. Season with salt and pepper.
In the meantime, wash the lemon thoroughly, rub dry and finely grate the peel. Squeeze 1 lemon half. Wash mint, dab dry, pluck leaves from the stalks and cut into fine strips.
Mix quark, yoghurt, remaining garlic, lemon peel, 1-2 tablespoons lemon juice and mint. Season to taste with salt, pepper and sugar. Heat the rest of the oil in a large frying pan and fry the chicken skewers on each side for about 2 minutes.
Then season with salt and pepper. Arrange chicken skewers on a plate, bulgur and sauce in a small bowl. Garnish as desired with lemon, mint and pepper.