Look for a shiny taco truck parked in front of a do-it-yourself car wash. The big fat breakfast tacos are $1 a piece and you get your choice of scrambled eggs with bacon, ham, potatoes, nopalitos, machacado (shredded beef), chorizo or roasted peppers on a corn or flour tortilla. The flour tortillas are handmade, and the chorizo is truly exceptional. The thick green salsa is tart and hot. There's no coffee, but there are fresh-fruit aguas frescas available. Check out the advertising illustrations painted on the sides of the truck — they are among the most interesting examples of taco truck art in the city. And if you're worried about the sanitary standards, it might comfort you to know that everybody behind the counter wears hair nets.