Wash and peel off onions, ginger, and garlic
Chop them into big chunks
Pour onion chunks into cooking oil in a saucepan under medium heat
Blend ginger, garlic, and pepper and add to oil. Stir until tender
Add tomato puree. Stir for 20 minutes
Continuously stir the mixture until its light brown
Add powdered shrimps and herring then Stir in seasoning and salt to taste
Add the dried powdered pepper, nutmeg and Allow simmering on a low heat till the color is dark brown.
Remove from fire and allow it to cool
Store in a dry clean bottle with the oil on top of the sauce.