Step 4:: FERMENT
The piña mash is loaded into large wooden vats and is covered with water. The shredded agave, wood, and wild yeast turn the sugars into alcohol. The distiller will test the liquid and mash to see when it is time to distill. This is roughly a week, more or less. A skilled palenque master, making mezcal the ancestral method, will simply just sense when it is ready.