Makrell i tomat (mackerel in tomato sauce)

Instructions

1. Clean the mackerel, remove the head and gut them, then cut into 4 cm pieces.
2. Finely slice the onion and cook it in the oil until translucent.
3. Add the chopped tomatoes, vinegar, sugar, salt, pepper, mustard seeds and bay leaves.
4. Let it simmer for 10 minutes to thicken the sauce slightly.
5. Gently lay the mackerel pieces in the sauce.
6. Cover and simmer over low heat for 12 to 15 minutes, without letting it boil.
7. Let it cool in the sauce before serving cold or lukewarm.