Danger Dog

After midnight on Avenida Revolución in Tijuana, a cart sits under a bare bulb with a flat-top over a propane burner, and the smell of rendering bacon reaches the sidewalk before the cook does. Frankfurters wound in bacon lie in rows on the steel, the spirals going from pink to copper while fat pools beneath them. The cook turns them with tongs, shoves a heap of onions and bell-pepper strips through the grease with the other hand, and splits a bun to warm on the edge of the heat. The wrap decides the result. Laid on in a tight spiral with the ends tucked under, the bacon seals to the frank as it crisps and the sausage steams in its own juices; laid loose, it unspools on the first turn and leaves one side pale and the other burnt.

The first bite is scalding, and people hold their breath through it. The bacon edge shatters, the frank snaps behind it, and a little grease finds its way down the foil to your wrist. The onions and peppers, softened in the same fat, taste of smoke and salt, and the sliced or grilled jalapeños add a green, bitter heat that clears the mouth for the next bite. The cook asks whether you want everything, then squeezes mayonnaise, ketchup and mustard in stripes along the bun and points the tongs at the salsa jar if you nod. The paper or foil goes translucent with grease in under a minute.

Carts like this line the avenue and the streets near the border crossing, and they gather again outside the bars of Ensenada, timed to the hour when the doors open and people spill out hungry. Across Mexico the thing is simply a hot dog, sometimes called a Tijuana-style dog, and the name carries no warning. Sonora's dogo rides a longer bolillo-style roll heaped with pinto beans, diced tomato and avocado, while the Baja cart dog stays small, sized for four bites standing at the curb. Everything on it comes off the one flat-top, so a Tijuana order tastes of a single pan: bacon first, then onion, then pepper, then the cold sweetness of the sauces.

In Los Angeles the same dog arrived with vendors who, by one researcher's estimate, began appearing around the city in the 1980s. They swapped the roll for the soft supermarket hot dog bun, the one bread easy to buy nearby, and trimmed the toppings to grilled onions and bell peppers with ketchup, mustard, mayonnaise and jalapeños. Many cook on stainless-steel trays over Sterno cans outside bars, concerts and ballgames, the blue flame lighting the foil as it comes off. The name danger dog points at the cart's legal standing, since many vendors work unlicensed and without refrigeration, and a dog that tastes of the same bacon and onion gets a different label on each side of the border.

From there the style followed the same trade routes of late-night crowds. San Diego, San Francisco and New York all have carts, and in San Francisco's Mission District the local version goes by mission dog, dressed with grilled onions, mustard, ketchup, mayonnaise and jalapeños. Southern Arizona never lost the Sonoran habit, so the beans-and-bolillo build still anchors the carts around Tucson. What travels in every case is the cart itself: a flat-top, a tray of wrapped dogs, a pile of onions and peppers, and three condiment bottles waiting at the corner when the bars let out.

Hermosillo, Tijuana and the Contested Start

Hermosillo, the capital of Sonora, is the birthplace most often named for the bacon-wrapped hot dog, and some tellers claim it for Tijuana or Mexico City. The carriers proposed for the American-style frankfurter include a traveling circus, bullfights and baseball games, and accounts conflict. The Sonora tellers share a street setting: a cart, a griddle, a strip of bacon laid around a frank to keep it moist over the heat, and a customer who wanted something heavier than a plain frank at the end of the evening.

By one account, vendors in Hermosillo were wrapping franks in bacon by the early 1950s, and the name attached to the first of them is Don Vicente, whose family has never been traced. Tijuana tellers claim the dog for their own avenue and its bars, where the cart version with an American bun and a short list of toppings is the one tourists meet first.

By the 1970s the Hermosillo carts had found their crowd at the entrance of the University of Sonora, where vendors called out beans, tomatoes, onions, mustard and crema to students walking between classes.