With several locations around the city, Federal Donuts has grown into a sugar-coated Philly favorite. FD's secret weapon is a "Donut Robot," a mechanical monster-mastermind that handles all the dough dispensing, frying, and flipping. The deep-fried dough rings are sweet, sinful, and eminently scarf-able -- coming in flavors like maple-bacon, lemon bar, spicy PB&J, Turkish mocha and, of course, classic glazed. Because specializing in just one caloric indulgence doesn't cut it, this spot slings famous fried chicken in a changing lineup of rubs and sauces (coconut curry, anyone?).