Of potatoes to make mashed potatoes, cool, boiled vegetables cut into thin wedges,you can add hot milk. Prepared a bamboo Mat spread out an even layer of mashed potatoes, top with vegetables and chopped egg on top to squeeze out a thin strip of mayonnaise, put a strip of herring. Wrap it with a rug like sushi, cut, from top to put the pieces of herring and onions, sprinkle with wine vinegar. To make fluffy,fragrant sprig of parsley,I unfortunately was not.