The quintessential fish tapas of Madrid belong to La Trucha, located slightly off the northeast corner of Plaza Santa Ana. You can order a single slice of the house specialty of smoked trout on toast, but it’s so good that most people order a whole plate. To save a few euros, try the salad of mixed smoked fish. All that smoke and salt will make you thirsty, but draft beers are some of the cheapest in the neighborhood