Cedric Griffin gets ready for a Thursday morning opening at J.Leonardi’s Barbeque in east Austin. Barbecue and football have a lot in common, says Cedric Griffin, the former University of Texas star and NFL veteran who recently opened a trailer joint on Austin’s Eastside with partner Jerome Faulkner. “It’s a mental game,” Griffin explained, referring to cooking and playing ball. “Getting up and preparing yourself every day to be consistent. We have to be consistently good. We have to do our thing and cook our food to our taste.” J.Leonardi’s Barbeque (the J is for Jerome and Leonard is Griffin’s…