Mango Chutney

1 cup brown sugar
1 cup cider vinegar
1/2 onion, chopped
1/2 teaspoon ground ginger
1/2 teaspoon ground cinnamon
3 large, firm ripe mangos, peeled, pitted, and chopped
1/2 cup raisins (or golden raisins)
4 ounces rum

Mix sugar, vinegar, onion, ginger and cinnamon in a large, heavy pan. Cook over very low heat, stirring occasionally, until caramelized (onion will be a deep golden color). Add the mango, raisins and rum; cook 30 minutes, stirring occasionally.