Herbed Beef Kabobs
["1/4 c. oil", "2 Tbsp. cider vinegar", "1 tsp. onion powder", "1 tsp. celery seed", "1 tsp. garlic powder", "1 Tbsp. oregano leaves", "1/2 tsp. ground black pepper", "1 Tbsp. prepared mustard", "1 medium bay leaf", "2 lb. boneless beef sirloin", "16 (1 1/2-inch) pepper squares (green, yellow or red)", "16 medium mushroom caps", "4 small onions, quartered"]
["Combine first 10 ingredients in a saucepan.", "Heat to boiling point and cool. Cut meat into 1 1/2-inch cubes and add to the mixture in a Ziploc bag along with pepper squares, mushrooms and quartered onions.", "Mix well. Let stand in refrigerator overnight."]
["oil", "cider vinegar", "onion powder", "celery", "garlic powder", "oregano", "ground black pepper", "mustard", "bay leaf", "boneless beef sirloin", "pepper", "mushroom caps", "onions"]