Combine lentils and water in a saucepan over medium heat; bring to a boil and cook about 20 minutes.
Stir potato, red bell pepper, onion, garlic, salt, and pepper into the lentils; continue cooking until the potato and lentils are tender and cooked through, about 15 minutes more. Garnish with cilantro and green onion to serve.
All done! Now take a photo, rate it, and share your accomplishments!