Thanks to the blog, Strange Maps, for sharing this map of the four regions of South Carolina barbecue sauce (and to reader, jmunchie, for sending us the link!). The two dominant North Carolina styles, eastern-style vinegar and pepper and western-style tomato drift southward, and Georgia's ketchup creeps in from the west. South Carolina's own mustard-style, a reflection of the state's German heritage, holds back the outsiders from within.
Related Reading: "A Very Brief History of the Four Types of Barbeque Found In the USA" by Lake E. High, Jr., President, South Carolina Barbeque Association
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