The road to a perfectly smoked brisket winds its way through tiny Texas trailers, remote roadhouses and sweaty holes in the wall with layers of peanut shells on the floor. If you don’t know where to look, the best barbecue can be elusive. To help track it down, we asked some of our favorite chefs for guidance at the annual Austin Food & Wine Festival. Andrew Zimmern, Richard Blais and barbecue maestro Aaron Franklin are among the pros who reveal their top picks for a pilgrimage.