Peel off the onions, ginger and garlic, wash and slice into small pieces.
Put a pot over medium heat, add cooking oil to heat.
Add the sliced onions, ginger, garlic and pepper and fry for about 15 min.
Carefully collect them from the oil and allow cool.
Put the oil back on heat and add the tomato puree, fry till it separated.
Blend the fried <a href="https://afrifoodnetwork.com/recipes/chicken-vegetable-soup/">vegetables</a> and add to the tomato puree, keep stirring and allow to cook for about 10 -15 min.
Add the dried ingredients, powdered shrimps, bony fish/anchovies and herrings.
Pour the seasoning, nutmeg, cloves, dried powdered pepper and allow simmer on a low heat till it turns dark brown.
Check for salt and add if needed.
Allow cool and put in a dry clean bottle or sterilized jar and store for about 2-3 months with the oil on top of the sauce, however, keep refrigerated once it starts being consumed.