To make quicos, you first have to find them. Almost any Latin American market will carry them in 1-pound bags labeled “maiz gigante” or “elote gigante.” They will look like giant, dime-sized dried corn kernels and usually cost a few dollars. If you’re having trouble finding them locally, you can find them online:
Quicos are made in much the same way as popcorn: warm a few teaspoons of oil in a pan, add the kernels, cover the pan and shake occasionally. After a few minutes, they’ll start to pop. Loudly. I nearly jumped out of my shoes the first time I made these!