For the kefta (meatballs): • ground lamb (about 400 grams) • garlic, minced • small onion, finely chopped • breadcrumbs or crushed crackers • salt • black pepper • About 2 tablespoons finely chopped parsley • For the sauce: • pitted green olives (about 400 grams) • mushrooms, sliced (about 200 grams) • onion, finely chopped •