Guava BBQ Sauce

Combine the following ingredients:

10 ounces guava jelly
2 teaspoons mustard powder
4 tablespoons white vinegar
1 teaspoon cumin
2 shallots, minced
1/4 cup dry sherry
3 tablespoons tomato paste
2 tablespoons corn syrup

Combine sauce ingredients in a saucepan and bring to a boil over medium heat. Reduce heat and simmer for 2 1/2 hours. Remove from heat and cool.