To make kefir grains, one needs to slaughter a still milk fed sheep and scrape the lining
from the small intestines. This intestinal flora is them introduced into a goatskin bag
with milk. The mixture is left to ferment for 48 hours, shaking the bag every hour.
After 48 hours of fermentation, the mixture should be coagulated, at which point 75% of
the mixture is discarded and replaced with fresh milk. This procedure is repeated for 12
weeks, at which point a polysaccharide layer will form on the goatskin.
This layer is removed and used to ferment milk. As the polysaccharide ferments the milk,
the grains will propagate (grow in size).
source: The Anunnaki Gods