Clean and chop the mackerel. Remove the bones. Remove the skin. We leave the fillet pieces.
Pour a teaspoon of salt into the fish and pour in 9% vinegar. It should stand for half an hour.
During this time, three carrots on a carrot grater in Korean.
Cut the onion into long strips, about five cm each.
Cut the cucumber into long cubes. We put the vegetables together, add salt, seasonings, and thoroughly knead them with our hands.