Alper Sarikaya — Beef Shish Kabobs

Ingredients

• 1 lb beef , tenderloin or top sirloin, cut into 1 1/2 inch cubes
• 1/2 C olive oil
• 2 tbsp red wine vinegar
• 2 tbsp lemon juice
• 1 clove garlic , minced
• 1 tsp mustard powder
• 1 tsp thyme , fresh, minced
• 1 tsp oregano , fresh, minced
• 1 tsp salt
• 1/4 tsp black pepper
• 1 large sweet onion
• 8 cherry tomatoes
• 2 bell peppers , seeded and cut into 1 1/2 inch squares
• 8 oz mushrooms , white, stems removed