This section is from the book "The Epicurean", by Charles Ranhofer. Also available from Amazon: The Epicurean, a Complete Treatise of Analytical and Practical Studies on the Culinary Art.
These mackerel come already prepared like sardines in oil; open the cans, remove the mackerel and dress them on a side dish with chopped parsley around and surround with slices of lemon.
Raise the fillets from the mackerel, remove the skin, and trim them into thin slices, lay these on a dish, and between each, set a slice of cold boiled potatoes. Sprinkle over a vinaigrette of oil, vinegar and pepper, dredge over some chopped chervil, very tiny squares of shallot and some chopped fennel and tarragon leaves.
 
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