¿Cómo se dice legit? The elegant Donostia might be on the edge of Tompkins Square Park, but with its marble bar, Spanish mosaic floor, and brass tones it looks like it was airlifted out of a Basque city. The narrow space is occupied mostly by that wide bar, where friends convene, bartenders pour Txakolina, and couples share pintxos. There’s a small private room with a table for larger parties, too, and a rectangular space in the back, where you’re afforded more privacy and can watch the sole cook shave jamón or prepare montaditos in the minuscule kitchen. First and foremost, this is a proper sherry bar. The restaurant has more than 40 different sherries to choose from, covering all the varieties from nutty Oloroso to figgy Pedro Ximénez to dry and floral Manzanilla. There’s top-notch vermouth, too, drunk straight or made fizzy with soda, as well as a variety of good-quality Spanish wines. But it’s very much worth coming here to snack. On the lengthy menu there’s a buttery Spanish-style tortilla amplified with cheese and generous ribbons of jamón, excellent conservas like pungent cockles in brine and mussels in escabeche sauce, and Spanish charcuterie. You won’t want to skip the morcilla bocadillo; the savoriness of the blood sausage is nicely balanced by the sweet caramelized onions.