Are you talking about this?
An alcoholic beer-like drink that was brewed and drunk by the Wari, a civilization that thrived in what is today Peru from about 700 to 1000 C.E., before mysteriously disappearing. The chica made by the Wari was made from the berries of the molle pepper plant. Some people today still drink chica, which is now made from corn.
On page 301 in this Google book, The Chemistry of Common Life
is the preparation of Chica http://books.google.com/books?id=bcMNAAAAYAAJ&pg=PR17&lpg=PR17&dq=chica+be er&source=web&ots=RyCQMeC6mA&sig=vMpEAff2RXWkNXeTa nXWGBTU8i0&hl=en#PPA301,M1
You know you're supposed to get a bunch of people together to chew on corn then spit it into a fermentaion container don't you?
Technically, chicha is/was make by converting starch into sugar by chewing it, and letting disastase enzymes in human saliva do the starch/sugar conversion - you can do this yourself by chewing bread for a long time, and noting how it gets sweeter. The chewed starch material (maize, cassava, whatever) is spat out and dried, or semi-dried, until the brewer is ready to soak it and ferment it. Some sources say the name chicha is derived from the Spanish word for “spit.”
Now I'm all for exploring ancient brewing techiques and all, but not THAT much.
If you don't want to go that route, here's a recipe that doesn't require mastication, just normal mashing...
There's a great article on the Archeology of it. http://www.eurekalert.org/pub_releases/2004-07/fm-abd072704.php
I found all this by google....*Hint Hint*