Cook beet, cool, peel, cut into thin stripes and sprinkle with vinegar. Bathe mushrooms, soak in cold water for 3-4 hours, then cook in the same water until done.

Mince 1 onion and fry in a part of oil. Shred the second onion and mushrooms. Mash garlic.

Mix all the ingredients, dress with the remaining onion, salt and sugar to taste.