Put meat through a meat-grinder and combine with presoaked rice, beaten egg, finely chopped onions, salt and black pepper. To make stuffed peppers, remove stems and seed from bell peppers and fill with meat mixture. Boil meat bones to make broth, place stuffed bell peppers on top and cook over low heat about 30 minutes. Serve 4-6 peppers on each plate and top with strained broth.