In a bowl, combine egg yolk, ground beef, onio , salt and pepper. Shape mixture by teaspoonfuls into 24 balls. Remove crusts from bread; roll flat and cut into 1-1/2-inch rounds. Place meatballs on bread rounds; make a depression in each ball and fill with a cube of cheese, making sure bread is coverd with meat mixture. Place on baking sheet. Broil in preheated oven about 5 inches from heat 3-5 minutes or until no pink remains. Garnish with ketchup, mustard, sliced green onions or sliced dill pickles, if desired.
Instructions
In a bowl, combine egg yolk, ground beef, onio , salt and pepper. Shape mixture by teaspoonfuls into 24 balls. Remove crusts from bread; roll flat and cut into 1-1/2-inch rounds. Place meatballs on bread rounds; make a depression in each ball and fill with a cube of cheese, making sure bread is coverd with meat mixture. Place on baking sheet. Broil in preheated oven about 5 inches from heat 3-5 minutes or until no pink remains. Garnish with ketchup, mustard, sliced green onions or sliced dill pickles, if desired.