“I’m a small cook from a small town. It’s the seventh largest city in the United States. It’s called San Antonio.” Jason Dady tells me this, wide-smiled and sweating, while he hovers over a Big Green Egg at last month’s Austin Food & Wine Festival. He’s grilling a whole branzino that has been simply dressed with fresh herbs and a little olive oil. It’s just one of the grilling secrets he shares with us. Many more, right this way…