Casa Dani

"One of the most famous stalls in the city’s Mercado de la Paz, this always-busy spot serves up generous portions of croquetas, oxtails—and a tortilla de patata that people cross the city for. What makes their version next level is that they fry the potatoes in sunflower oil, which helps them retain their original, sour flavor that’s complemented by the sweetness of the onion. Casa Dani’s tortilla can be anything you want it to be—breakfast, lunch, dinner, a snack, or an epic hangover cure after a late night of drinking too much garrafón (poor-quality liquor) at a discoteca. Any tortilla this good needs worthy sidekicks, so opt for salmorejo, a creamier version of gazpacho topped with egg and ham, or fish fresh from the market’s vendors. There’s also a menu del día for €15 (they post a photo of the chalkboard menu options on weekdays to Facebook, so rack your brain for your 2009 login) that gets you an appetizer, main, dessert, and coffee." - lori zaino

"Tortilla española may seem overrated to some, but for locals, it’s quite the comfort food. It is offered everywhere in the city, but only a few bars and restaurants serve the potato omelet fresh and cooked to perfection. For that, head to Casa Dani, a family-owned bar and restaurant that makes more than 200 a day. Best known as tortilla de patatas, the version here is beloved for its well-done exterior and gooey interior. At lunchtime, the place gets packed, so go around 11 a.m. to enjoy a slice with a café con leche without having to fight for a seat. While there, also give the callos a la Madrileña (Madrid-style veal tripe) a try." - Paula Móvil

"Tortilla española may seem overrated to some, but for locals, it’s quite the comfort food. It is offered everywhere in the city, but only a few bars and restaurants serve the potato omelet fresh and cooked to perfection. For that, head to Casa Dani, a family-owned bar and restaurant that makes more than 200 a day. Best known as tortilla de patatas, the version here is beloved for its well-done exterior and gooey interior. At lunchtime, the place gets packed, so go around 11 a.m. to enjoy a slice with a café con leche without having to fight for a seat. While there, also give the callos a la Madrileña (Madrid-style veal tripe) a try." - Paula Móvil

"Casa Dani is the kind of no-frills neighborhood bar where napkins litter the floor, cafés con leche (more on coffee in Spain here) come in half-pint glasses, and servers holler orders through the kitchen window. In other words, it's the last place you'd expect to find the city's most exquisite tortilla española: Spanish potato omelet. The kitchen averages 400 a day, cracking 2,000 eggs and frying 1,700 pounds of potatoes in the process. One bite of the still-warm omelet—a holy trinity of oil-poached potatoes, caramelized onions, and oozy egg—and you'll understand why the dish is in such high demand." - Benjamin Kemper