Not completely defrost the herring, cut off the head, remove the insides, wash. Cut onion rings, carrots into slices, herring into slices. In a glass bowl alternating, we spread the layers: Onions, carrots, mustard, pepper, herring, salt, sugar. Fill with vegetable oil, close the container tightly and shake. Put the herring in the refrigerator for 1-2 hours. Ready herring can be served to the table. Enjoy your meal!