1. In a large bowl, mix together yogurt, garlic, curry, and tumeric; season with salt and pepper. Add lamb and toss to coat. Marinate, covered, refrigerated, 2 to 3 hours.

2. If using bamboo or wooden skewers, place in a shallow dish and cover with water, 30 minutes before meat is ready to cook.

3. Preheat a grill pan. Thread lamb pieces onto skewers, alternating lamb with vegetables and bay leaves, if desired. Place skewers on grill pan and cook until meat has reached desired degree of doneness, about 10 minutes for medium-rare.