2 days 10 mins
Rinse the lentils (or beans) 2-3 times, then drain. Soak them in 3 times the water overnight or at least 8 hours.
Discard the soaking liquid, and rinse and drain them. Transfer the lentils to a large mason jar.
Cover the jar with a damp paper towel or muslin cloth, and secure that with the hollow outer ring of the canning lid.
Invert the jar and place it tilted in a bowl or lay it sideways on the countertop. Keep it in a cool dark place for another 12 hours.
By now lentils would have grown little white tails. Depending on the weather and location, this might take 24-36 hours.
If the tails are too small, rinse and drain the lentils and store them for another 8-12 hours.
Dry and store them in an airtight container and refrigerate until ready to use.