Mackerel with plum chutney

1) Heat the olive oil in a large pan and cook the onion and garlic until soft.
2) Add the spices and fry for 1-2 minutes.
3) Add the tomatoes, vinegar, sugar and salt, simmer until everything thickens.
4) Add the plums and cook until soft.
5) Remove from the heat and leave to cool.
6) Heat the rapeseed oil in a large, heavy frying pan.
7) Place each mackerel fillet, skin side down and fry for about five minutes, turn and cook until cooked through.
8) Serve the mackerel with the chutney.