Peel and shred plantain, then spread on a baking sheet lined with aluminum foil or baking mat. Place in the oven and bake for 20-30 minutes at 400 degrees F. Half way through, use a spoon to stir or flip shredded plantains so they dry evenly.
After 20-30 minutes, remove the plantain from the oven. Let it cool before blending. Now blend until powder, and set aside.
In a blender, add onion, scotch bonnets, garlic, ginger, scotch bonnets, and njangsa, pour water and blend until consistent and smooth, then transfer to a large bowl.
Add seasonings, white pepper, cloves, and plantain powder, and mix well until there are no lumps, you adjust the thickness by adding more water.
Pour oil into a pot over medium heat, add onion, and cook until translucent or light brown. Then add the raw mixture and stir until combined. Cook for about 10 minutes on medium heat.
Keep checking pot every 5 minutes to add water if needed and to avoid it from burning.
After 15 minutes, add fish, cover the pot with a lid and continue cooking for another 10 minutes until cooked. Avoid overcooking.
Transfer to the serving bowl and serve immediately.