You can use regular supermarket lentils or seek out organic lentils if you prefer. Place your desired quantity of dried lentils in a jar and cover with water. Sprouted lentils will triple or quadruple in volume so decide how many cups of sprouts you want to end up with. Leave to soak overnight.
The next morning, drain and rinse your lentils. Return them to the jar without water and either cover the jar with fabric or poke holes in it's metal lid. Turn the jar upside down, propped up on chopstick for drainage and air circulation, or lay the jar on it's side.
Come back to your lentils twice a day and give them a rinse and drain. After 24 hours you may start to see little tails forming.
After 2 - 3 days your sprouted lentils are ready to eat. Taste them as they sprout and eat them when you like the taste. Any leftovers can be refrigerated for up to a week.