Salad "officer"

Boil separately potatoes, beets, carrots, cool, peel and cut into cubes. Remove fluid from fish, remove bones. Cut the onions into cubes, pour cold water for half an hour, then drain the water. Lay a flat dish with lettuce leaves, mix the salad ingredients and place on the leaves. Apply a mesh of mayonnaise on top and sprinkle with crushed green onions.