Combine the lentils, onion, garlic, ginger, coconut oil, salt, turmeric and crushed red pepper in a 6- to 8-quart slow cooker. Stir in 6 cups of water. Cook on low until the lentils and onion are tender and the flavors have mellowed, about 5 hours. About 30 minutes before the cook time has elapsed, open the lid, and whisk vigorously to help the lentils fall apart. Stir in the coconut milk and greens. (At first, the lentils will seem quite loose, but they will thicken.)
Cook for the remaining 30 minutes, to heat the greens and coconut milk. Add more salt and crushed red pepper to taste.
Serve in bowls topped with chile crisp.
