- 1 cup dark rum
- 12 tablespoons (1 1/2 sticks) unsalted butter
- 1/4 cup light brown sugar
- 1 vanilla bean
- 8 ounces mascarpone
- 1 ripe pineapple, peeled and sliced into 1/4-inch-thick rounds
- 1/2 cup fresh blueberries
- Combine the rum, butter, and sugar in a small saucepan and simmer, whisking often, until the sugar has melted and the mixture is slightly thickened, about 10 minutes. (The glaze can be made a few days in advance, cooled, covered, and kept refrigerated. Bring to room temperature before using.)
- Cut the vanilla bean lengthwise in half and scrape out the seeds with the tip of a sharp knife. Whisk the mascarpone and vanilla seeds together. (The mascarpone can be made a day in advance, covered, and kept refrigerated.)
- Heat your grill to high.
- Grill the pineapple slices, brushing frequently with the glaze, until browned, 2 to 3 minutes per side.
- Remove the pineapple to a platter or serving plates and top each slice with a dollop of vanilla mascarpone. Garnish with a few fresh blueberries. Serve immediately.