Poach the Mackerel Fillets and let cool. Once cooled, remove the skin. To make a smooth dip, use a blender to puree the meat and onion. This puree can be added to sour cream or salad dressing. Add spices of your choice (dill, Cajun, other).
If you want chunky spread, chop onions and fish into size you prefer and add to sour cream.
