In a medium size mixing bowl mix the beans, tomato, cilantro, cumin, ancho chili powder, garlic and salt and pepper. Mix thoroughly and form into 4 even sized cakes. In a medium size teflon saute pan heat a small amount of vegetable oil and brown off both sides and keep warm in the oven until the Moi is done.
In the same saute pan, heat a little more oil and saute the Moi, skin side down first. Deep fry the plantain slices, season with salt and set aside. Serve the Moi with the black bean cakes and garnish with fried plantains and cilantro.