1 Place meat cubes in a bowl with the soy sauce, sesame oil, ginger, onions, garlic, sugar, pepper and sesame seeds.2 Marinate 1 hour, turning occasionally. Wash and dry the mushrooms.3 Cut off tough stem ends. Remove meat cubes from marinade and string on skewers alternately with the mushrooms.4 Broil, basting with marinade, until the desired degree of doneness, not more than 5 minutes.