Rinse the red lentils under cold water until the water runs mostly clear
Pick out any debris or small stones
Add 1 cup red lentils to 2 to 3 cups water or broth in a pot
Bring to a boil over medium-high heat
Reduce the heat to low and simmer
Skim off any foam if needed
Cook for 10 to 15 minutes, stirring occasionally
Add more liquid if needed to keep them from sticking
Season with salt near the end of cooking
Remove from heat when the lentils are soft and breaking down
Drain any excess liquid if desired
Serve as is or use in soups, curries, dal, or purees