NASHVILLE, Tenn — For over six decades, Mary’s Old Fashioned Pit Bar-B-Que has been a beloved restaurant in North Nashville, serving up mouthwatering barbecue to generations of loyal customers. But after surviving everything from tornadoes to a global pandemic, the iconic eatery is preparing to close its doors for the last time. The family-owned restaurant, which opened in 1962, has been a fixture on Jefferson Street, offering a taste of tradition that kept people coming back for more. Owner Katresa Fizer, whose grandmother, Mary, started the business, says it’s time to step away and embrace something new. Fizer fondly remembers…