Sprinkle fish with salt and let stand for 12 hours. Wash. Place in boiling water for 2 minutes. Remove from boiling water and put in large bowl in layers. Between layers place onion rings and slices of lemon; sprinkle with pickling spices. Bring to a boil 3 cups vinegar and 1 cup water. While hot pour over meat. Let stand for 48 hours.
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