Place pork loin in large ziplock bag. Combine remaining ingredients except Spicy Yogurt.

Sauce; pour over pork in bag. Seal bag and refrigerate overnight. Remove pork from marinade, discard marinade.

Place pork over drip pan on grill. Grill over indirect heat in covered grill until meat thermometer inserted reads 155ºF, about 1-1 1/2 hours. Let rest 10 minutes (internal temperature will rise slightly upon standing) before slicing thinly to serve. To serve, slice roast thinly and serve with Spicy Yogurt Sauce.