When in San Sebastián, you absolutely must do as the locals do weekends at midday—hit the streets for a vermouth. It’s basically the Spanish equivalent of brunch, and one of the best spots to do it is A Fuego Negro.
Famous as an avant-garde pintxo bar, A Fuego Negro actually has one of the the best tortillas (Spanish omelettes) in town: the perfect in-between runny and gooey, intense yellow-orange, with tender bits of potato and onion. They also have their own vermouth, The Beltza. These two together, plus a secret ingredient, a live DJ spinning vinyl on (many a) Sunday makes it a top place to day drink.