Peel the potatoes and cut them into appropriate sizes.
Put the potatoes in a pot and boil them.
When the potatoes are cooked, drain them in a strainer to remove excess water.
Place the potatoes in a bowl and mash them.
Finely chop the onion, cucumber, and carrot.
Add the chopped vegetables, mayonnaise, salt, and pepper to the mashed potatoes.
Mix well and serve on a plate to finish.