For the recipe in the original, well-washed potatoes in the peel are taken. We in the family do not like to eat potatoes, so I peeled potatoes.
So let's get started. The potato has a slightly cut top on one side.
Slice the potatoes in a circle, without cutting to the bottom by about 1 cm. Hold the knife straight, not at an angle, otherwise the middle of the potato will fall out. Make several such circles. I have medium-sized potatoes, I managed to make 2 circles. If the potato is large, then you can cut 3 circles.