Duck carnitas tacos and tall margaritas. Does the human race need anything more? Actually, yes: we need the cochinita taco too, the pork paired with pickled onions and habanero salsa. And come to think of it, the barbacoa (savory braised beef) tacos are pretty necessary too. The owners of Zocalo pared down their ambitions for this relatively small restaurant in Lincoln Park. In doing so, they greatly enhanced the experience of eating there.