In a large bowl, mix the yogurt, oil, spices and salt to form a smooth marinade.
Add the meat and veggie pieces into the bowl and give it a gentle mix. Let this marinade for 15-30 minutes, or longer for 1-2 hours if possible. For best results, let the meat marinate in the fridge overnight for 6-8 hours.
When you're ready to cook, heat a grill pan on medium-high heat. Gently skewer the meat alternating with the peppers and onions, and grill until lightly brown and cooked on all sides.
Alternately, you can also grill them on the BBQ or bake in a oven for 20-25 minutes at 400 degrees till the meat is completely cooked through.
Garnish with fresh lemon wedges and serve immediately with some Green Chutney on the side.