Our lunch at Zavala’s Barbecue in Grand Prairie, this is what Texican BBQ perfection looks like. (Photo ©David Woo/Texas BBQ Posse) Barbecue lovers: You have two more Saturdays to head to Grand Prairie for some of the best food, served by some of friendliest people, the Texas BBQ Posse has come across in some time. After that, you’ll have to wait a few months to see why Posse co-founder Chris Wilkins declared, after his first visit to Zavala’s Barbecue, “A star is born.” (That was back in May, so, no, Chris wasn’t pilfering from the sensational new movie starring Bradley…