1/2 cup Dijon mustard
1/4 cup packed brown sugar
1/4 cup red wine vinegar
1 teaspoon dry mustard powder
1 teaspoon salt
1 teaspoon freshly ground black pepper
1/2 teaspoon ground dried chipotle pepper
1 pinch cayenne pepper, or to taste 4 cloves garlic, minced
2 teaspoons vegetable oil, or as needed
Mix together and marinate overnight. Grill.