Drain mackerel and remove the largest bones and the majority of skin. Break up in bowl, then add therest of the ingredient, mixing with a fork.
Separate into 4 patties, about 3.5 oz. each. Cook for 4 minutes on a George Foreman grill, or ad a Tbsp of oil to a skillet and fry for 4-5 minutes each side.
Serve hot by itself, or with tartar sauce. Or you could make a sandwich.