On a sweet spring evening, it’s fun to sit outside on the picnic tables and chow down on the pulled pork barbeque sandwiches at this moderately priced restaurant. Inside or out, Pierce’s is casual. Food experts have rated Pierce’s, a local legend, among the top 100 barbeque joints in America. Pierce’s secret is its sauce, created in Tennessee and carried to Virginia more than 35 years ago when Pierce’s first opened. For those who don’t eat pork, there’s barbeque chicken, and the kids’ menu features hot dogs and chicken tenders.