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Finely chop the herring fillet. If you have a whole fish, then first gut it and cut it into fillet. How to properly cut an entire fish on a fillet? Remove the tail, head and fins. Along the ridge, cut the carcass to the spine. Turn over on a barrel. Cut the meat from the ridge bone with a sharp knife. Turn over the carcass and cut the fillet on the other side. Clean from the inside, removing the black film, as it will mustard and spoil the taste. Rinse and dry well.