Tandoori Chicken Kabobs

Name: Tandoori Chicken Kabobs
Ingredients: 2 small chickens (about 2 1/4 pounds each), split or quartered; 2 tablespoons lemon juice; 2 tablespoons yellow food coloring (optional); 1 tablespoon red food coloring (optional); 2 tablespoons ground cumin; 1 tablespoon Garam Masala or ground coriander; 1 to 2 teaspoons ground red pepper; Coarse salt, to taste; 2 cups yogurt; 2 tablespoons grated fresh ginger; 1 tablespoon minced garlic; 6 tablespoons usli ghee, clarified butter or extra-virgin olive oil; Onion, tomato, and cucumber slices, for garnish