Put the lentils in a sieve and rinse well. Put the lentils in boiling water and simmer for about 3 minutes. Turn off the stove. Let the lentils steep for about 15 minutes. In the meantime, put the beans in a sieve, rinse well and drain.
Clean, wash and cut the peppers into pieces. Clean and wash the watercress. Peel onions and cut into rings. Peel garlic and chop finely. Put lentils in a sieve, rinse and drain.
Wash the rosemary and shake dry. Wash the meat and pat dry. Heat 2 tablespoons of oil in a large frying pan. Add rosemary and chops and fry on each side for about 3 minutes. Remove and keep warm.
Heat 2 tablespoons of oil in the same pan. Add the onion rings and garlic and fry over a low heat for about 2 minutes. Add bell peppers, beans, lentils and vinegar and cook for about 4 minutes while turning.
Season with salt, pepper, sugar and Italian herbs. Carefully fold in watercress. Arrange bean salad and lamb chops on plates.