Instructions: Mix the sugar and water in a medium-size saucepan. bring to a boil over moderate heat, stirring once or twice to help the sugar dissolve. Boil 5 minutes. Remove from the heat. You should have 2 cups.

Meanwhile, core the pineapple and cut into 1/4" chunks. You need about 1 1/2 cups.

Melt butter in a medium-size heavy saucepan over moderate heat. Add the pineapple and cook 1 1/2 minutes, stirring occasionally, until the pineapple is hot. Add the rum or vanilla and let bubble 1 1/2 to 2 minutes.

Add the brown sugar syrup and bring to a boil. Remove from the heat. Serve warm. The sauce keeps in the refrigerator at least a week.

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