1. In a large bowl, mix the yogurt, oil, spices and salt to form a smooth marinade. 

2. Add the meat and veggie pieces into the bowl and let this marinade for 15-30 minutes, or longer for 1-2 hours if possible. 

3. Gently skewer the meat alternating with the peppers and onions, and grill until lightly brown and cooked on all sides. 

4. Garnish with fresh lemon wedges and serve immediately with some Green Chutney on the side.