First you’ll need to measure about a cup of lentils and inspect them for stones. Then rinse them really well in cool water and place them in a large bowl of water to soak overnight 8-12 hours. The next morning. You can strain out the excess water, rinse and strain again and then transfer the seeds into a large jar, filling it no more than 1/3 of the way with seeds so that there’s adequate space for growth.
Now, cover the opening of the jar with some cheesecloth and hold it in place with a snug rubber band. For the next few days all you’ll have to do is rinse the seeds with fresh water by filling the jar and draining through the cheesecloth twice a day. If you start to notice any slime, just give a few extra rinses and get it all out.
Keep giving them the fresh rinses + draining for 4-5 days. Once that green leaf pokes out and starts to unfold, they’re ready to harvest. You can use this process to sprout many other seeds and beans (alfalfa, clover, mung, garbanzo, lentil, sunflower).
Via : Honest Fare