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In a large bowl, mix together egg yolks, salt, vanilla, and water.
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Add in the softened butter in small chunks.
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Gradually mix in the flour and baking powder.
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On a lightly floured surface, knead dough briefly, about 3 times. (Note on kneading: using the palm of your hand, press the dough out and with the help of a scraper gather all the dough pieces together. Repeat this process until dough can be easily formed into a smooth ball.)
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Form the dough in to a ball, wrap in wax paper and let stand in refrigerator for at least two hours, ideally overnight.
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On a lightly floured surface using a rolling pin, roll dough flat to 1/8” thickness.
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Using cookie cutters cut the dough into cookies. Be sure to cut out an even number of cookies.
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Use the smaller cookie cutter to cut out two shapes in ½ of the cookies. These will be used as the top layers of the cookies.
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Line baking sheet with wax paper or a non-stick liner.
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Lay cookies flat onto baking sheet.
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Bake in 350°F oven for 10 – 12 minutes until lightly golden.
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Once out of the oven, let cool on rack.
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Add a few drops of water to your favorite strawberry, raspberry or apricot jam in a small saucepan or microwave bowl. Heat on stove or in microwave (30 seconds) until jam is melted.
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Brush jam on the cookie bottoms (the solid cookies without the cutouts).
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Dust the cookie tops (that have the cutouts) with confectioner’s sugar.
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Cover cookie bottoms with the dusted cookie tops like a sandwich and fill in the holes with jam using a pointed spoon such as a grapefruit spoon.