Tom Craft doesn’t stray far from the kitchen. The co-founder of 2 Fat Guys American Grill in Hockessin is a full-time culinary arts instructor at Delcastle Technical High School. Consequently, he has summers off. Since partner Jeff Cook handles the restaurant’s on-site operations, Craft wanted a productive part-time gig, which, of course, involves food. Introducing  a surprising twist on the traditional slice. …