Cut the fish into large pieces and cook until done in salted and acidulated water. Drain, cool, and skin. Put into a preserving-kettle two quarts of vinegar, one cupful of boiling water, four blades of mace, two tablespoonfuls of sugar, a dozen cloves, two tablespoonfuls of mustard seed, an onion sliced, a dozen pepper-corns, one small red pepper, two bay-leaves, and a teaspoonful of celery seed. Bring to the boil, put in the fish, boil up once and cool. Let stand for two or three days before using.