Prep time includes 7 hours to marinate beef cubes.
Combine and stir all ingredients. Put marinade and beef cubes in a one gallon storage bag with zipper. Refrigerate for 7 hours.
Toss marinade. Fill skewers, one each, in this order: beef cube, pepper, onion, mushroom, beef cube is there is room for another beef cube.
Use full length skewers to make this a dinner entree for two.