Cochinita pibil comes from the Yucatan peninsula, and the second half of its name tells you how it was cooked: pib is the Maya word for the earth oven, a pit lined with hot stones, the meat lowered in wrapped in banana leaf and buried under earth for hours. That method is still used for fiestas, for weddings, for the days when a whole pig is worth the digging. The rest of the time it happens in an oven or a heavy pot, and the result is close enough that nobody in Tulum treats it as a compromise.

Here it belongs to Sunday morning. Cochinita is sold out of pots at markets and from folding tables on street corners from about seven, and by eleven the good ones have nothing left but a spoonful of juice at the bottom. People buy it by the kilo for the family, or eat it on the spot in tacos, or in a torta, the bread pressed down until the juice soaks the crumb. It also turns up on panuchos and salbutes, and it is the standard filling for anything that needs shredded pork on the peninsula.

The taste is earthy rather than hot. Achiote gives colour and a faint resinous, peppery flavour, and the sour orange behind it does the real work, cutting the fat and keeping the meat bright after hours in the heat. The banana leaf adds a green, tea-like note you notice most when you first open the parcel. Heat is not part of the marinade. It arrives separately, in the pickled red onion with habanero that sits on the table, and in whatever salsa the cook keeps beside it.

Two things go wrong most often. The first is too much achiote paste, used as though it were a spice rub, which makes the meat chalky and bitter instead of savoury. The paste is strong, and a little thinned with plenty of sour juice is the point. The second is rushing it. Pork shoulder needs hours at low heat to reach the stage where it collapses under a fork, and pork that has to be cut rather than pulled has simply not been in the oven long enough. Keep the fat, keep the juices, and shred it coarsely: dry cochinita is usually cochinita that was shredded too fine and then left standing.