Fisher King Mackerel in Tomato Sauce

Mackerel bells 40% (catch area: North East Atlantic fao 27), tomato sauce 60% (water, tomato paste 11.4%, sugar, rapeseed oil, salt, spirit vinegar, mustard [water, mustard, spirit vinegar, sugar, salt, spices, color: curcumin], modified corn starch, spices {contain celery}, acidity regulator: citric acid; paprika concentrate).