Put lentils in large strain we and rinse under cold water. Transfer to large pot and cover with water.
Soak lentils in cold water 1 hour before cooking to reduce cooking time. Don't add salt as toughen lentils.

Cover pot and bring to boil. Remove lid and boil. Red & yellow cooks 15-20 minutes. Green take longer (40 minutes). Add more water if needed. Drain. & use.