For your refreshment, in frothy freeze-frame: Zacatelco agua de barranca. Literally "canyon water," this chilled Mexican beverage is also known by its Nahuatl name, cacahuatole, "cocoa water." Following the traditional practice in Zacatelco, a city in the Mexican state of Tlaxcala, the vendor vigorously whisked the cocoa by hand, then scooped it out with a jicara, a hand-decorated half-gourd. The jicara is the customary drinking vessel, too, but it's a pain to clean.
Agua de barranca stand
West side of Fifth Ave. near 50th St., Sunset Park, Brooklyn
Sunday only, and surely only in temperate weather