Ace s BBQ Sauce for Grilling

1 ½ cups distilled white vinegar

¾ cup prepared yellow mustard

¼ cup margarine

2 teaspoons salt

1 teaspoon ground black pepper

2 teaspoons crushed red pepper flakes

1 clove garlic, minced

1 tablespoon white sugar

Stir the vinegar, mustard, margarine, salt, black pepper, red pepper flakes, garlic, and sugar together in a saucepan over medium-high heat until the mixture comes to a boil. Reduce heat to medium-low and simmer until thickened, about 25 minutes.