Fresh grouper is a specialty at the Zamas resort. If you can't find chayote, a favorite winter squash of the Mayans, use zucchini.
Rub fish with oil. Sprinkle with salt and pepper.
Heat a large nonstick grill pan over medium-high heat; coat pan with cooking spray. Add fish; cook 5 minutes on each side or until fish flakes easily when tested with a fork. Serve with lime wedges and rice.
Note: Nutritional anlaysis includes rice.