Jennifer Maas TV Business Writer Food Network fires up the second season of “Bobby’s Triple Threat” Tuesday, treating fans to the return of host Bobby Flay and the three “titan” chefs he’s once again relying on to do the cooking competition for him: Tiffany Derry, Michael Voltaggio and Brooke Williamson. The trio will face off against chef Michael Symon as a team, going for three head-to-head rounds full of surprise ingredients and evaluated by a mystery judge on the Season 2 premiere Tuesday at 9 p.m.