Do a few things, and do them well. There is no simpler food emporium in Barcelona than Bar La Plata, named for the short Gothic Quarter alley where it is located. There is no menu. There are six, usually crowded, tables, but most patrons stand. Since 1945, customers have ordered four simple tapas plates over the marble counter, and it has proven to be a winning formula. Your choices are crispy fried sardines (pescaditos), buttifarra sausage, a salad of tomato wedges and raw onions, or anchovies and olives. Longtime fixture Pepe Gómez will serve it all to you, along with a glass of wine (or if you’re brave enough to try it, a stream of vino blanco from a glass porrón), and there you have it: tapas perfection for a few euros.