Wash the beets (raw, it is better to take sweet varieties), peel and grate on a coarse grater, pour the juice of half a lemon and leave for 15 minutes. Gently squeeze the juice so that it stacks.
Finely chop the onion and cucumbers, mix with beets.
Prepare the dressing: mix vegetable oil and soy sauce; to taste, you can add ground black pepper and a little lemon juice.