Panuchos are one of the two great evening antojitos of the Yucatan peninsula, the other being salbutes. Both are fried masa discs with meat and pickled onion on top. The difference, and it is the whole point, is that a panucho has a pocket of black bean paste sealed inside it before it goes into the fat. That thin layer of beans steams as the tortilla fries, so the finished thing is crisp on the outside and soft and dark in the middle. A salbut has no beans and puffs up hollow. People outside the region use the words interchangeably, which locals find odd in the way you would find it odd if someone called a crumpet a pancake.

The pocket comes from the tortilla itself. A well made tortilla, pressed thin and cooked on a hot comal, inflates on the second turn, and the top skin separates from the bottom. While it is still warm you slit the edge with a knife and open it like an envelope. That is the panucho. Nothing is glued or folded. If your tortillas refuse to puff, the masa was too dry or the comal was not hot enough, and the whole recipe stalls there, which is why it is worth pressing a few practice ones before you commit.

In Merida, Valladolid and here in Tulum they are food for the end of the day. Stands set up in the plazas after dark, and the standard order is a mixed plate of panuchos and salbutes with a bottle of something cold. Turkey is the traditional topping, simmered plain with onion and oregano and pulled into shreds, though cochinita pibil has become just as common and is what most visitors are served. On top go pickled red onions, a little shredded cabbage or lettuce, tomato, sometimes avocado, and habanero on the side for whoever wants it.

The taste is layered rather than loud: sweet fried corn, the mineral heaviness of the beans, meat that is savoury but not spiced hard, then the sour onions cutting through all of it. The onions are not a garnish. Without their acid the panucho reads as heavy and one note. The other common mistake is frying too long. You want the base crisp and the surface set, not a cracker. Thirty to forty seconds a side in hot fat is usually enough.