Ben provided a wonderful journey through the process that Lalocura uses to create and maintain his ancestral mezcal line.
Ancestral Mezcal definition:
Roast: Agave hearts in an underground stone oven
Crush: One of the following; by hand, with a tahona, a Chilean or Egyptian mill
Fermentation: One of the following; stone, earth, wood, clay, animal skins. Agave fibers must be included.
Distillation: Must happen with direct fire on a clay pot still. Agave fibers must be included.
Currently, Minneapolis has very few ancestral made mezcals. Off the top of my head, I can think of Vago Ensemble and this brand. I love this line, so please look for it or ask for it at your local liquor store or stop into Popol Vuh & Centro to sample it.