It may not be well-known outside of that region, but that’s the point; going all-in on new (for me) discoveries to share (with you) is one of the cornerstones of Finding Food Fluency.
Today’s spotlight may taste like a coarse tamarind shake — i.e. something sweet and sour — but there’s none of that legume floating anywhere near this Mexican drink.
Tejuino, a Prehispanic drink attributed to the Nahuas people of northwestern and central Mexico — roughly, Colima, Jalisco, Nayarit, and Sinaloa — comes from the Nahuatl word tecuín meaning “to beat/palpitate.” It is used for ceremonial purposes by the Yaqui of Sonora and the Tarahumara of Chihuahua as offerings to sacred deities; you may even see it consumed at a typical Mexican fiesta in Jalisco and Nayarit.

I encountered tejuino for the first time in Culiacán, Sinaloa. Having no idea what it was, I further went down the rabbit hole by trying it at a street stall where everything was baking in the sun.
And yes, tejuino is an alcoholic beverage, though has a low alcohol content.
Although some of its ingredients may vary depending on who’s preparing it, tejuino counts as its staples corn masa — you know, the stuff used to make tortillas, piloncillo/panela — that is, unrefined cane sugar, water, and a small amount of lime juice. Boil it all, let it chill out for a bit, then cover it with something breathable. Fermentation will happen, and then you’re done!
What was a bit odd about this street stall was that after trying it as is, the vendor insisted on adding a little Squirt Soda to the tejuino. Honestly, I wasn’t a fan of it either way, and in that heat I was that much worse off. Nevertheless, I’d try it again … at a restaurant, when not on a 10-mile trek!