In a large bowl, mix the steak, mushrooms and onion.
In a medium bowl, mix the remaining ingredients (garlic through lime zest). Pour sauce over the steak and vegetables mixture.
On large skewers, alternately thread each ingredient.
Place skewers on grill and cook for 5 to 8 minutes on each side, until beef reaches desired level of doneness and vegetables are charred on the edges. Serve warm.
Notes
SERVING SUGGESTION: Faux-tay-toes (steam cauliflower till tender; drain; mash with butter, cream cheese and salt and pepper to taste till you get a mashed potatoes texture).GLUTEN FREE: No changes necessary.NUTRITION: 350 Calories; 27g Fat; 19g Protein; 9g Carbohydrate; 2g Dietary Fiber; 63mg Cholesterol; 51mg Sodium. Exchanges: 0 Grain (Starch); 2 1/2 Lean Meat; 1 1/2 Vegetable; 0 Fruit; 4 Fat.