Butter Rum Ham and Pineapple

1 1/2 pounds fully cooked, boneless ham
2 tablespoons butter
2 tablespoons brown sugar
2 tablespoons rum extract
1/2 peeled/cored pineapple

Preheat 2-sided tabletop grill. Cut four 1/2-inch thick slices from ham (reserve any remaining ham for another use). Place butter, brown sugar and rum extract in small microwave-safe bowl. Microwave on HIGH 30