Heat oil in a large pot over medium heat. Cook cumin, turmeric and curry powder until fragrant, about 1 to 2 minutes. Add onion with a few pinches salt, and cook, stirring, until tender, about 6 minutes. Add garlic and ginger and cook, stirring, until tender, about 2 minutes. Add sweet potatoes and bell pepper and cook 1 minute.
Add lentils and Cleansing Broth. Bring to a boil, then reduce heat and simmer until lentils are tender, 20 to 25 minutes. Season with salt and pepper. Top with cilantro before serving.
Refrigerate stew in an airtight container up to 3 days.