I know that pre-Columbian chocolate was less sweet and more bitter, but I can't find a recipe for it. That fact probably means that it doesn't taste great, but I'd like to try it anyway.
The closest I've come was a recipe for "how the Spaniards transformed Montezuma’s favorite spicy beverage with the addition of alcohol."
Best Answer
Chocolate recipe was different for rituals or medicinal purposes. The recipes talk about adding some of the following: vanilla, powdered chilli, flowers as gueyncaztle, mecasuchil, maize as filler, honey, tlacoxoshitl..
Here is the recipe for Mexican hot chocolate from Food and Feasts with the Aztecs, Imogene Dawson (p. 29). It is adapted for modern kitchens:
Montezuma dined with Cortes and his Spanish Officers. At this meal the Mexica/Aztec king reportedly drank chocolate from cups of pure gold. Hernán Cortés then wrote:
Source: http://www.foodtimeline.org/foodmaya.html#hotchocolate
I recommend you to read Chapter 8 "From Bean to Beverage", page 100 on the book–180 on the PDF– of History, Culture and Heritage, Louis Evan Grivetti & Howard-Yana Shapiro