Boil the potatoes and egg until tender, cut into small cubes. I used a steamer: cut the potatoes into cubes, and then "steamed" together with the egg-15 minutes - in everything is ready. The main thing is not to forget to add salt.
Egg sliced with a vegetable cutter.
Cut the green onion into rings.
Radish cut into thin rings or half rings, depending on the size.