The defining Piedmont and Western North Carolina-style barbecue sauce, which basically takes an Eastern-style sauce and adds just enough ketchup (or ketchup-like ingredients) for a little sweetness and body, came into use after the Heinz company began mass-producing what we today know of as American-style ketchup around the turn of the 20th century. Most writers and historians credit German influence for this sauce; German immigrants were influential in the region and preferred to cook with pork shoulders over whole hogs (another defining feature of Lexington-style barbecue), and they are said to have created the sauce to mimic the sweet and sour flavor of dishes from Germany.
This pulled pork sauce originates from the Piedmont region of western North Carolina. Born out of a state-wide barbecue divide, this tangy, vinegar-based sauce adds a touch of tomato paste for sweetness and color.