Incise the skin of duck breasts diamond-shaped. In a frying pan heat the oil and fry the duck breasts skin side for 3 minutes, turn and fry another 3 minutes. Season with salt, pepper, put in a heat-proof dish. Bake in the oven at 200 degrees Celsius for 40 minutes. Peel the mango, cut the bone, cut into cubes. Simmer mango in heated fat 5 minutes. Add coconut milk and broth, add the cranberries and green pepper. Season with salt and pepper. Cut the duck breast into slices and serve with the sauce.