Put tomatoes, onions, celery, NDjansang, Bêpê, Rondelles, quatre côtés, pepper, ginger, garlic and Mbongo spice into a blender and blend everything into a puree
Place the mixture in a pot with the fish, add salt and oil, mix well and let marinate for about 10 minutes.
Then place the pot on the stove, cover the fish with water, and simmer for about 25 minutes, or until the fish is cooked through. Add more water if necessary to prevent the fish from sticking to the bottom of the pot.
Season with salt or broth if needed.