South Carolina Style Barbecue Sauce

Sauces

1 tablespoon vegetable oil
1/4 cup minced onion
1 tablespoon minced garlic
1/3 cup commercial yellow mustard; (like French's)
3 tablespoons ketchup
2 tablespoons light brown sugar
1/2 cup distilled white vinegar
1/4 cup water
2 teaspoons lemon juice
1/8 teaspoon ground black pepper
1/8 teaspoon ground cayenne pepper
1 tablespoon coarse salt

Heat the vegetable oil over moderate heat. Add the onion and garlic and cook for 5 minutes, or until slightly soft.  Add all the remaining ingredients, and simmer sauce, uncovered, for 20 minutes. (The sauce will thicken slightly.)