lamb with bone, cut into large pieces (1 kilogram) • carrots, peeled and sliced into rounds • sliced mushrooms (about 100 grams) • green bell peppers, sliced • large potato, peeled and cut into medium cubes • medium tomatoes, diced • garlic cloves, sliced • large onion, sliced into wedges • vegetable oil (60 ml) • butter (14 grams) • water (240 ml) • salt (15 grams) •