Mexican food, explained

Tacos al pastor, explained

That vertical spit of marinated pork with a pineapple balanced on top is the most recognizable image in Mexican street food. It's also, strictly speaking, not originally Mexican — and the story of how it got here explains why it tastes the way it does.

By Tasty México · Playa del Carmen, Quintana Roo

It started with shawarma

In the early twentieth century, Lebanese families emigrating to Mexico settled in significant numbers around Puebla and Mexico City. They brought shawarma with them: lamb stacked on a vertical rotisserie, roasted slowly, shaved off in thin slices as the outside cooks.

Their children and grandchildren adapted it to what was around them. Lamb became pork. Pita became the corn tortilla. And the Middle Eastern spice blend picked up Mexican chiles and achiote — which is where that deep brick-red color comes from. The Mexico City version of the dish is still sometimes called tacos árabes' descendant, and in Puebla you can find both side by side.

The name means "shepherd style," a nod to the lamb it started as.

Al pastor is what happens when an immigrant dish gets fully adopted by its new home.

What the trompo actually does

The trompo — the spinning vertical stack — isn't showmanship. It's a cooking method that does something an ordinary grill can't.

Thin slices of pork are marinated and stacked into a cone weighing anywhere from a few kilos to well over thirty. As it rotates past the flame, only the outer layer cooks at any moment. The fat from the upper layers renders and runs down through the whole stack, continuously basting everything below it. The taquero shaves off the crisped exterior, and a fresh layer is exposed to the fire.

That's why al pastor has a texture nothing else does: the same piece of meat is simultaneously caramelized and crusty on one side and juicy on the other. You cannot reproduce it in a pan.

So why the pineapple?

Partly flavor — a slice gets carved down with the meat, and the acidity cuts the fat. Partly function: pineapple contains bromelain, an enzyme that breaks down protein, so the juice dripping down the trompo tenderizes as it goes.

The famous move where the taquero flips a piece of pineapple off the top and catches it on the tortilla is genuine, not a tourist trick. It's also a decent signal — someone doing that has done it ten thousand times.

How to tell a good al pastor stand

• The trompo is actually spinning and actively cooking. A cold or stationary stack means the meat is being reheated, not roasted.
• They carve to order. The taquero should shave meat directly onto your tortilla when you ask, not from a holding tray.
• The stack has visible layers and a dark, glossy crust. A pale, uniform cone hasn't developed anything yet.
• Evening hours. Al pastor is night food in most of Mexico. A trompo that's been running since noon has had its best hours already.
• There's a line. The stack has to sell fast enough to keep cycling through fresh layers. Slow stands cook the same exterior over and over.

How to order it

"Dos de pastor, con todo" gets you two tacos with onion, cilantro, and salsa. If you want it without something, say "sin cebolla" (no onion) or "sin cilantro." Ask for "con piña" if pineapple isn't automatic.

Salsa is nearly always on the side, in two or three colors. Green is usually tomatillo-based and milder; red is usually dried chile and hotter — but not always, so try a little first. Lime goes on everything.

The point

Al pastor is a good reminder that "authentic" Mexican food was never frozen in time. It's a Lebanese cooking technique, Mexican chiles, a Caribbean fruit, and a corn tortilla that predates all of it — assembled on a street corner and perfected over three generations.

That's not a compromise of tradition. That's how tradition actually works.