In a medium saucepan, combine the black beans, coconut milk, lime juice, chili powder, and salt.
Bring the mixture to a boil over medium-high heat.
Reduce the heat to medium-low, cover, and simmer for 10 minutes to allow the flavours to meld.
Stir in the mango pieces, replace the cover, and cook for an additional 3 minutes, or until the mango is heated through.
Serve warm with rice and your favorite salsa.
Stir in a handful of fresh, chopped cilantro just before serving to add a bright, herbaceous flavour.
Sauté a little minced garlic, ginger, or lemongrass in the saucepan before adding the other for a deeper aromatic base.