In a saucepan over low heat, mix the brown sugar, chile sauce, rum, soy sauce, ketchup, Worcestershire sauce, garlic, dry mustard, and pepper. Simmer 30 minutes, stirring occasionally. Cool, and refrigerate until ready to use.
1 cup brown sugar
1/2 cup chile sauce
1/2 cup rum
1/4 cup soy sauce
1/4 cup ketchup
1/4 cup worcestershire sauce
2 cloves garlic (crushed)
1 tsp dry mustard (ground)
ground black pepper (to taste)