Cut the bread rounds and set aside.
Chop the eggs and mix in mayo, mustard and Black Dog Belly Rub
Spread the egg mixture on the bread round.
Chill in refrigerator for 1 to 8 hours.
Just before serving garnish each round with the black caviar. I use a fork because you only want the caviar not the juices that are in the jar.
Leftover caviar can be used for other dishes or if you are serving a big crowd double the recipe.