Philly’s Barbecue Boom Continues With a Fast-Casual Spot on Walnut Street

American barbecue may take hours to smoke, but restauranteur Tom Lau thinks it should be served quick. Lau is opening Butcher’s Smokehouse, a fast-casual barbecue restaurant at 1221 Walnut Street with a setup he compares to Chipotle, in what was previously pizza and sandwich shop Pandora’s. He …