In South Carolina you’ll find a barbecue sauce unlike any other. Instead of the deep brown or red barbecue sauce you may be used to, many South Carolina barbecue sauces are yellow, with a significant amount of mustard.

In medium saucepan, heat butter over medium heat until melted. Add the onion; cook until tender. Add the additional ingredients. Simmer for 30 minutes. Store in the refrigerator until ready for use.