There was once a woman whose father was a lead dancer with the Bolshoi. She was born on a ferry boat in the middle of the river (Amur?), crossing into Sinkiang, China to escape the revolution. Her father loved caviar and had old time czarist tastes, so this is the real skinny, folks. Buy the most of the best you can afford; there IS a difference in taste! Finely chopped boiled egg with a touch of binder is ok. She never mentioned onions but Russians tend to like green onions. Cucumber side dishes are good too. Above all, keep it ICE COLD. Use small plates or bowls on crushed ice. It's salted and partially dried so it probably won't go bad. Cold enhances the taste and fussing over it increases the mystique. Serve with the smallest spoons you can get your hands on.