Prepare a serving plate and a 16 cm ring mold. Boil the vegetables, let them cool, and peel.
Separate the egg whites from the yolks. Grate the potatoes, carrot, egg whites, and processed cheese separately.
Mash the mackerel with a fork, combine with the onion, and spread as the first layer. Salt lightly and spread with mayonnaise.
Add a layer of potato and mayonnaise, then a layer of carrot and mayonnaise again.
Next add a layer of egg white and processed cheese, and spread with mayonnaise.
Scatter the crumbled yolk on top and chill the salad in the fridge to let it soak.