Prepare the Beans: Wash and boil the beans with water and some onion until extremely soft; mash them almost smooth with a wooden spoon or hand mixer
Soak Peppers: Soak dried peppers in hot water until soft, then drain
Blend Paste: Blend the softened peppers, some onion, and a little water (and ginger/garlic if using) into a smooth puree
Fry Onions: Heat a generous amount of palm oil in a dry pot until very hot, then add sliced onions and fry until they start to caramelize and turn brown (or even black for a smoky flavor)
Cook the Sauce: Reduce heat, add the blended pepper paste, crayfish, seasoning, and optional fish to the fried onions
Stir often and fry on low heat for 30-40 minutes until the sauce darkens and thickens, absorbing the oil
Combine & Serve: Spoon the dark sauce over the mashed beans and serve hot with bread, yam, or plantain