...Fieri's meteoric ascent is impressive, but it also makes him one of the culinary world's most polarizing figures. For as many fans as Fieri earns—Dora Long, the creator of Fieri's biggest fan site, says she gets “hundreds of emails a week”—he draws equal detractors. Like Rachael Ray or Emeril Lagasse, Fieri is a food personality who has rapidly outgrown the food, walking the narrow line between technique and celebrity that makes so many in the industry nervous. His recipes have names like “No Can Beato This Taquito,” and “Mac-Daddi-Roni Salad,” and he often effuses about the greasy meals he eats...