Very popular at Green Bay Packers games, together with other picnic foods at tailgating parties.
In a bowl, mix ground beef, chopped onion, and eggs. Season with salt an pepper.
Distribute over among slices of bread. Put another slice of bread on top. Ready!
Garnish with thinly sliced onion or gherkins, if you wish.
Whole meal or rye bread can be a great base for this sandwich.
Form hamburger style patties and shallow fry, if you like meat well cooked.