Cut pineapple crosswise into six 3/4-inch-thick slices.
Stir together butter, brown sugar and curry powder. Grill pineapple slices on an uncovered grill directly over medium coals for 6 to 8 minutes or till heated through, turning once and brushing once or twice with butter mixture.
Combine yogurt and coconut.
To serve, cut pineapple slices in half. Serve warm with yogurt.