They decided to import a planeload from Israel. The only problem was they forgot to obtain an agricultural permit. The plane landed and for days they went from office to office trying to get permission to unload the plane. Wash them well. Cook the beets until you can pass a fork easily through them.
Some people prefer to substitute lemon juice for at least part of the vinegar.
My grandmother used to use sour salt. Dip your finger into the mixture until either you like the taste or you are sick of it. If you find you added already two liters of vinegar and 3 kilos of sugar you've got a problem. Some people like to add a pinch of cloves or even ginger. Slice the beets thinly.