Garden Bounty Beef Kabobs

Ingredients

• 1/4 cup reduced-sodium soy sauce
• 2 tablespoons olive oil
• 1 tablespoon molasses
• 3 garlic cloves, minced
• 1 teaspoon ground ginger
• 1 teaspoon ground mustard
• 1 pound beef top sirloin steak, cut into 1-inch cubes
• 1 large sweet onion, cut into 1-inch pieces
• 1 large green or sweet red pepper, cut into 1-inch pieces
• 1 medium zucchini, cut into 1-in. slices
• 1 pint cherry tomatoes
• 1/2 pound large fresh mushrooms
• 1 cup reduced-fat sour cream
• 1/4 cup fat-free milk
• 3 tablespoons onion soup mix
• 2 tablespoons Dijon mustard
• 1/8 teaspoon pepper