If you have a juicer, use it. I grated the beets on a fine grater and squeezed out the beet juice with a spoon and strainer. Since beet cake contains a lot of juice, I fill it with water and squeeze out the juice again. Freshly squeezed beet juice looks very nice! There is an opinion that you can not use freshly squeezed beet juice, before serving it needs to stand in the refrigerator for a while.