Firm tomatoes (opt); 1/4'd Green peppers (opt); cubed Salt Oregano and lemon quarters *Note: Lamb meat(s) should be cut into cubes the size of walnuts. Place the lamb, sweetbreads, and kidney cubes in a large non-aluminum bowl. Make a marinade of the oil, lemon juice, wine, herbs, garlic, and pepper and pour over the meat. Marinate in the refrigerator, preferably overnight, or for at least 3 hours. Thread the meat on long skewers alternating the bay leaves with the tomatoes and peppers, if desired. Grill over hot coals or broil 6 inches from the heat, brushing with the remaining marinade and turning frequently. Season with salt and pepper, then remove the meat from the skewers to a warm platter and crush oregano over the top. Garnish with lemon quarters and serve hot.