Sometimes also spelled "Buttergeback".
1-1/8 cup butter, softened
1-1/8 cup sugar
2-1/2 tablespoons vanilla sugar
2-1/4 cups flour
2 tablespoons condensed milk
1 egg yolk
Hard boil the 3 eggs in boiling water (about 10 minutes) and let cool. Peel the eggs and reserve the yolks. Discard egg whites. Pass the egg yolks through a chinoise or strainer. Beat the yolks with the butter , sugar, and vanilla sugar until creamy. Sift the flour and add to the butter mixture. Mix well. Wrap in plastic wrap and let chill in the refrigerator for 1 hour. Preheat oven to 350 F. Lightly grease a cookie sheet. Roll out dough on a floured board to 1/8" thick. Cut into desired shapes with cookie cutters and place cookies on cookie sheet. Mix the raw egg yolk with the condensed milk and brush the top of each cookie with this mixture. Bake for about 18 minutes or until lightly golden. Yield depends on size of cookie cutters used.
Photo by Melissa Cuppett. Used with permission
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