African Style Shish Kebab

Name: African-Style Shish Kebab
Ingredients: 8 ounces plain yogurt; 2 tablespoons lemon juice; 1 teaspoon olive oil; 1 large onion, minced; 1⁄2 cup chopped mint leaf; 2 tablespoons chopped fresh cilantro or 2 tablespoons fresh parsley; salt and pepper; 1⁄4 teaspoon cayenne pepper; 2 lbs boneless leg of lamb or 2 lbs beef sirloin, cut into cubes; 18 cherry tomatoes; 2 green peppers, cut into chunks; 18 small white onions, peeled (you can use pearl onions); 18 medium mushrooms