Begin by preparing the beans. To do this place them in a bowl with plenty of water to cover them well and leave to soak for 3 hours or overnight, if possible. If you're in a hurry and don't have time to soak them, you can instead add 1/5 of a teaspoon of baking soda to the water the beans will cook in.
After soaking, rinse and drain the beans in a colander.
Add the beans to a pot or pressure cooker and enough water to come up to about1 inch/ 2.5 cm above the beans. Simmer the beans until tender but not too soft. Add more water if necessary but not too much, to avoid ending up with a watery porridge.
The, add the chopped onion and plantain and allow to simmer until the plantain pieces soften.
Stir in the crayfish, stock cube, palm oil, and season with salt and pepper to taste. Turn the heat down to minimum and cook for a further 10 minutes.
Serve your delicious Beans and plantain porridge with a side of bread or topped with tomato stew.