Mash the liverwurst in a bowl.

Add the softened cream cheese to the bowl with the liverwurst.

Add the chopped hard-cooked eggs to the bowl.

Mix the liverwurst, cream cheese, and eggs together.

Add mayonnaise to the mixture until it reaches a moist and spreadable consistency.

Season with onion salt, salt, and pepper to taste.

Butter each slice of rye bread with soft butter or margarine.

Spread the liverwurst mixture onto the buttered slices of bread.

Assemble the sandwiches by placing another slice of bread on top of the spread.

Cut the sandwiches in half or serve whole.