My grandfather managed to weasel this recipe from a famous, local barbeque restaurant. My mom and I make batches at a time and keep jars on hand for gifts. The sauce has the perfect balance of tangy and sweet and makes amazing barbeque chicken and ribs.
FIRST In a large stock pot combine cider, garlic salt, red and black pepper, and celery seed and bring to a boil. Add mustard, stirring with a whisk until smooth.
NEXT Reduce heat to low, whisk in ketchup, lemon juice, and sugar. Cook, uncovered, over low heat for 2 hours, stirring occasionally.
LAST Ladle hot sauce into sterile mason jars; secure with lid. Once lids have sealed (you will hear the lid make a popping sound) store in pantry until ready to use.