Cook lentils in water according to package instructions.
While lentils are cooking, in a separate medium sized pot, add sweet potato, coconut milk, basil, sriracha, and spices. Bring to a simmer and let simmer until sweet potato is soft and fully cooked (about 15 to 20 minutes depending how large they are cut).
Stir in the chopped green pepper and cooked lentils. Let simmer another few minutes.