If you're looking for an authentic Piedmont (vinegar-based with tomato), North Carolina BBQ sauce, then look no further than Oink Moo Cock-A-Doodle Doo Best Tastin' Barbecue Sauce. This lip-smacking sauce is one of our favorites, and it's whipped up by two ole country gals off the farm in Yadkinville, a little town northwest of Winston-Salem. We thought the name and…