Cut two pounds of salmon steaks into strips. Put into a saucepan with half a cupful of water, salt and pepper to season, a clove, a blade of mace, a tablespoonful of sugar, a chopped onion, and a heaping teaspoonful of mustard mixed with half a cupful of vinegar. Bring to the boil, add six tomatoes peeled and sliced, a teaspoonful of minced parsley, and a wineglassful of Sherry. Simmer for forty-five minutes and serve either hot or cold.