I think that it can be prepared for a festive table in winter. In order to quickly prepare a salad, you need to pre-bake or cook the beets and store them in the refrigerator.
To prepare the salad, prepare the necessary products.
Bake or boil beets, boil potatoes “in uniform”.
Peel the onion and boiled vegetables.
The herring also needs to be cleaned and the bones removed (for cooking fillets).
Cut the prepared ingredients into medium cubes.
Prepare the salad dressing.
Mix sunflower oil with grainy mustard.
Season the salad and let it brew for thirty minutes.