How to cook marinated mackerel. The most delicious fish recipe ever.

This recipe has been popular for centuries. This is how my grandmother used to cook. You have never tasted anything tastier.
Ingredients:
2 mackerel 1 liter of water
2 Art.spoons of salt
1.5 tbsp. spoons of sugar
11 bay leaves
17-20 peas of black pepper
Oil
4 olives.