Cook the beetroot like jacket potatoes in salted water (depending on your taste you can also add a little whole caraway seeds to the cooking water).
When the beetroot is done, let it cool down. Then peel and grate finely on a grater. Mix about 1-2 tablespoons of mayonnaise (depending on the size of the spoon) into this mixture and season with salt. Let it steep in the fridge.
Serve straight from the fridge.
I adopted this recipe from our Ukrainian au pair and it is now loved by the whole family with meat and potato dishes.