For years, Dar Filettaro a Santa Barbara (to use the hole-in-the-wall's official name) has been serving just that—battered, deep-fried fillets of salt cod—and not much else. You'll find no-frills starters such as bruschette al pomodoro (garlic-rubbed toast topped with fresh tomatoes and olive oil), and sautéed zucchini. In winter months, the cod is served alongside puntarelle, chicory stems tossed with a delicious anchovy-garlic-lemon vinaigrette. The location, down the street from Campo de' Fiori in a little piazza in front of the beautiful Santa Barbara church, begs you to eat at one of the outdoor tables, weather permitting. Be prepared for service as Roman as is the food: that is, brusque.
Largo dei Librari 88, Rome, 00186, Italy