Cows and pigs of North Georgia beware: Jason and Brooke Martin are packing some serious heat — about 225 degrees of it for 12 to 18 hours. The owners of Moonie’s Texas Barbecue, a Flowery Branch favorite for more than six years, have opened a new location at 250 John Morrow Parkway in Gainesville. Since August 2011, they’ve sold a style a barbecue coming from central Texas, just one among many from Texas and the nation as a whole, at their Atlanta Highway location in South Hall. “Even Texas has its own its own nuances,” said Brooke, sitting at one of the Gainesville shop’s long, checkered tables. “We’re meat-focused, not sauce-focused.”