Pitmaster and co-owner Daniel Castilla mans the grill at Heritage Barbecue & Brewery in San Juan Capistrano, which is looking to expand. A historic barn and six covered smokers took a step closer this month to becoming part of Heritage Barbecue’s bid to expand in San Juan Capistrano. Paul Garcia, San Juan Capistrano’s principal planner, told commissioners the roughly 2,000-square-foot …