Nowhere in Mexico City does one feel the collective weight of the largest population in North America more than on Avenida Lazaro Cardenas, the traffic artery that gushes a surfeit of humans and cars up the heart of the city’s downtown. The gutters stink of rotting fruit. Dirt and littered garbage encrust the sidewalks. And, at rush hour, walking a block means suffering a gauntlet of elbows and hands pushing at you and past you. For the most part, the businesses that line this street offer little comfort. Goods lie in heaps on carpets or hang two feet deep upon the walls of stores seemingly designed to be fire hazards, cramming too many people onto too little floor space.

Churros, the long, skinny, crenellated, sweet fried crullers made from just flour, water and salt, have been enjoyed for centuries in Spain, with hot chocolate and without. However, in Barcelona, xurros, as they are called in Catalan, are becoming an endangered species. In recent years, more than half of the xurrerias in the city have disappeared. Many of the old-timer xurreros who still survive have the odds stacked against them: permit renewal for a street stall is near impossible; rent has become prohibitively expensive and continues to increase; or required updates to old infrastructure might prove extremely costly. However, we know of one young newcomer who has emerged with fresh energy and inspiration, incorporating lessons from the masters in his creative take on xurros. The best way to save this endangered species is to eat it, so here are our five favorite xurrerias, which make these star-shaped doughnuts with great care – and with delicious results that are worth seeking out.

Editor’s note: This feature from Barcelona is the third installment in our series this week devoted to the top street foods in each of the Culinary Backstreets cities. In Barcelona, a great deal of eating is done in the streets. Sidewalk cafés line the plazas and paseos, often to the point that it’s difficult to tell which tables belong to which establishment.

The past year has been a very good one for food in Mexico City. We’ve had a wonderful time exploring new restaurants, tracking down exciting dishes and meeting great people along the way. There have been so many memorable moments over the past year that it was hard to sit down and come up with a list of the ones that really stood out the most. Through debate and discussion (and some revisits), we narrowed down the worthy field to our top favorites. Here are our Best Bites of 2012 from Mexico City. El Pozole de Moctezuma First up on our best food experiences of the year would have to be the pozole at El Pozole de Moctezuma. Located near Metro Garibaldi, the building is nondescript and shows no sign of the deliciousness that lies within, so if we hadn’t been taken there by a friend, we never would have known about it. But what a discovery! The friendly staff showed us exactly how to build the perfect bowl of pozole, from choosing the color and flavor of the broth to adding oregano, chili powder, lime juice and, of course, a splash of mezcal. A bowl of soup never tasted so good or filled us up more satisfyingly than that at El Pozole de Moctezuma. Best of all, the place is a long-term neighborhood fixture that celebrated its 65th anniversary in 2012, a fact that bodes well for future visits.