Russian Layered Beet Salad with Herring (Shuba)

"Layered Beet salad with Herring that gets its unique name from the beets, potatoes, carrots and scallions that cover the diced herring like a fluffy coat. Each layer is dressed with either a mayo or sour cream dressing, but in my family, it has always been only mayonnaise. For beautiful serving it’s better to use portion ice-cream bowls or glass soup bowls so that all layers of salad are visible. It’s convenient to form salad with the help of culinary ring or a side from detachable baking dish."