Pick from:
[+] Discard any remnants of the lentils that are no longer usable as a side dish. This method isn't ideal for baking dishes which contain seasoned red split lentils..
[+] Rinse and cut the dry lentils into pieces or quarters. If the lentils appear damp, place the pulp into a strainer or sieve before separating them..
[+] Rinse under running water and pick out any obvious large pieces of debris. Pour the washed red split lentils into a saucepan for cooking..
[+] Add the lentils to a large stockpot. Choose a medium-size stockpot so that it can hold at least 1 1/2 to 1/2 quarts (122 to 250 ml) of water..Choose from options above and answer: What most naturally follows?

How to cook red split lentils
Wash the dry lentils.
Place the split red lentils into a sieve or fine-holed. Split red lentils are notorious for having debris in them, so be sure to clean well.
Answer:
Rinse under running water and pick out any obvious large pieces of debris. Pour the washed red split lentils into a saucepan for cooking.