Grilled Sirloin Steak Kebabs

Directions

1. 1
   In a medium mixing bowl, combine the soy sauce, olive oil, Worcestershire sauce, brown sugar, onion powder, garlic, and pepper. Stir until combined.In a microwave safe bowl, drizzle the onions with a little bit of olive oil and microwave them for about 4 minutes. (They need to be cooked a bit before being skewered.Thread the beef, onion, and bell peppers onto a skewer. In a large baking dish, pour the marinade over the kebabs and let them marinade for at least an hour or up to 24 hours.
2. 2
   Remove kebabs from marinade and pat dry.
3. 3
   Place them on a pre-heated grill over medium heat for about 8-10 minutes.