Heat the coconut oil in a large pot over medium heat. Add the coriander and cumin and fry until fragrant, about 30 seconds.
Add the onion, ginger, bell pepper, and cook until the veggies soften.
Add the black beans, sweet potato, and broth.
Increase the heat to high and bring to a boil, then reduce the heat to low and simmer, with the lid ajar, for about 35 minutes, or until the flavors have melded.
Add in the coconut milk and cook for about 15 more minutes, until the stew has thickened.
Stir in the lime juice, and season with sea salt and freshly ground black pepper.
Serve fresh over white or brown rice and top with cilantro.