Burro

Order one in Tucson and you ask for a burro, not a burrito, and the word is the whole tell. Through Sonora and across the Arizona line, the everyday name for a wheat tortilla wrapped around a filling is the full animal, burro, donkey, and the diminutive burrito reads as the visitor's word from somewhere with smaller tortillas. The two names are not two foods. They are the same closed wheat parcel under a regional accent, and the masculine, unshortened one carries a particular geography with it: the wheat belt of northwestern Mexico and the border city that treats Sonoran cooking as its own. Calling it a burro tells you, before you have taken a bite, which side of which tradition you are standing in.

The filling philosophy is the other thing the name signals. A Sonoran burro is built around one thing done well rather than a packed load: shredded machaca, the dry beef of the ranch tradition; carne seca, beef dried in the desert air and shredded fine; refried beans alone; beef stewed red in chile colorado. There is no rice laid in as ballast, usually no shredded cheese and lettuce piled in for bulk, and the salsa and the lime arrive on the side rather than inside. The restraint is the point. The wheat tortilla is meant to read as a quiet wrapper and the meat as the loud center, and a burro overstuffed in the manner of a coastal Californian cylinder loses exactly the lean directness the Sonoran build is after.

The tortilla is what makes that spareness possible, and it is unlike the tortilla almost anywhere else in Mexico. Sonora is wheat country, not corn country, and its daily bread is a wheat-flour round stretched startlingly thin and griddled large, pale and supple and freckled with dark blisters where it hit the dry steel. Warmed soft it folds without a crack and seals around a tight core; left to cool it stiffens and tears at the first fold and unloads down the wrist. A round that big and that thin is strong only while it is warm and only while the filling is laid in a disciplined line, which is why a Sonoran cook keeps the load spare and the roll under tension rather than packing it to bursting.

Hold a fresh one and the wheat reaches you first. The Sonoran tortilla has a soft, faintly sweet toasted-wheat flavor from the high-heat blistering, a different register from the earthy corn of central Mexico, and it reads as wrapper rather than floor under the meat. Under it the core is dense and salty and warm: the fibrous pull of machaca, or the deep concentrated savor of carne seca that carries further on the tongue than fresh beef does, the red chile colorado finishing slow and warm. The parcel sits warm and a little taut against the palm, the seam side seared where it pressed the griddle, and because the salsa rode on the side the thin wheat holds intact to the last bite instead of slumping into paste.

The relatives sort by scale and by cooking. The diminutive burrito, in Sonoran use, is often just the smaller wheat wrap, the everyday short one against the burro's larger build. Stretch the form to a forearm's length and load it as a self-contained meal and you reach the burro percherón, the oversized evening-cart specialty of Hermosillo and Ciudad Obregón, named for the heavy Percheron draft horse. Seal a burro shut and drop it in the fryer and the wheat lacquers into the rigid shell of the chimichanga, a different cooking on the same wrapper. And the giant foil-wrapped rice-and-bean cylinders that traveled out of California are a maximal twentieth-century reading of the same northern Mexican wheat wrap, scaled up far past what a Sonoran cook would call a burro.

At a Tucson counter the order is short and the size is assumed: the meat called by name, machaca or carne seca or frijol for the bean build, the tortilla understood to be the big Sonoran one, a wedge of lime and a cup of salsa de chile set alongside. The trade is daytime and democratic, breakfast through dinner, the burro the workaday handheld of a city that calls flour tortillas its birthright. Regulars defend one shop's machaca over the next the way other places argue barbecue, and what they are defending is always the meat, since a wrap kept this lean gives a dull filling nowhere to disappear.

The name, the wheat, and a Tucson counter

The wheat is the part of this story that carries a date. Spanish missionaries brought the grain into northwestern Mexico in the colonial era, and Sonora's dry climate took to it in a way most of corn-eating Mexico never did, which is why the region's everyday tortilla is wheat and why a wrap built on a large flour round is native here rather than borrowed. The name has a Sonoran telling that is folk and faintly mocking: recorded by the historian Horacio Sobarzo, it holds that dubious stands were rumored to sell donkey meat, and customers called the tacos burros in suspicion of what was inside.

Where the dish does touch the dated record is across the line in Tucson. El Charro Café opened on the city's east side in 1922 and is generally counted the oldest continuously family-run Mexican restaurant in the United States, and its signature for a century has been the carne seca burro: beef sun-dried on a cage above the building, shredded, and rolled in a Sonoran flour tortilla with a spritz of lime. The restaurant is a fixed point for the Sonoran burro on the United States side, a place where the spare wheat wrap has been served continuously since the 1920s.

So the lineage runs in two registers at once. The thing itself is an old folk wrap of the Sonoran wheat country with no inventor and no first burro, and the name is regional slang older than any kitchen that codified it. The hard dated anchor is a storefront: El Charro Café, east-side Tucson, serving its carne seca burro on a Sonoran flour tortilla since 1922.