Instructions: In a mixing bowl, combine egg yolk, ground beef, onion, salt and pepper. Shape mixture by teaspoonfuls into 24 balls. Remove crusts from bread; roll flat and cut into 1 1/2-in. rounds. Place meatballs on bread rounds; make a depression in each ball and fill with a small cube of cheese, mak- ing sure bread is covered with meat mixture. Place on baking sheet. Broil in preheated oven about 6 inches from heat for 3-5 minutes or until no pink remains. Garnish with ketchup, mustard, sliced green onions or sliced dill pickles if desired.

Yield: 2 dozen

NOTES : "

This is a recipe from my mother. I like to make up a batch or two and store in the freezer till Im ready to cook them."

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