Place the lentils into the glass jar and cover with the water. Then, either loosely screw on the lid or place a cheesecloth over the top of the jar and secure it with a rubber band. Leave the lentils to soak for at least 8 hours, preferably overnight.
Once the lentils are soaked, drain them and return them to the jar.
Next, cover the jar. You can use either the cheesecloth method or a mesh sprouting lid. Then, place the jar on a sprouting stand or simply lay it on its side - which you choose is down to your personal preference.
Rinse and drain the lentils once a day for 2-3 days, or until you are happy with the size of the sprouts.