Grant Pinkerton, owner and pitmaster at Pinkerton’s Barbecue in Houston, during a visit in June. (Photo @Michael Ainsworth/Texas BBQ Posse) There’s a note with a phone number on the door of Pinkerton’s Barbecue in Houston. It’s addressed to all Hurricane Harvey and flood rescue workers who might show up in the middle of the night. “We live right above the restaurant,” owner Grant Pinkerton explains. “The note says, call this number and we’ll come down and cook for you.” The Texas barbecue community has certainly stepped up to the challenge of helping the state’s residents recover from the unprecedented storm.…