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1
Combine the ingredients for each of the two fillings, and store each one in a bowl to use later. We used a meat grinder, fastened onto the kitchen table to combine the walnuts and dried fruits together.
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2
Sift together the flours. Traditionally, we used only apf, but white whole wheat is a delicious addition. If necessary, you could try a gluten-free apf (Arrowhead Mills). Using a pastry cutter blend the butter and lemon zest to the flour.
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3
Mix in the beaten egg yolks. After these are incorporated, mix in the sour cream or fage and 6 oz. of sugar. Divide the dough into 4 balls and refrigerate until chilled (at least half an hour).
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4
In between parchment paper roll out the dough, one ball at a time, to a wide strip, roughly in modules of @ 2 inches. Strive for a 1/8 inch thickness, or even a bit less. Keep the rest on the dough refrigerated until you are ready to work with the next batch. Cut out 2 inch squares from the rolled dough. You should get about a dozen from each ball. If you have scraps, you can re-roll them. Refrigerate if the dough gets too sticky, with the butter melting at room temperature.
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5
Place a teaspoon of filling in the center of each square. Taking the opposite corners overlap them and then give them a firm pinch. Brush evenly with egg whites. Continue with the rest of the dough in the same way. Bake in a 400 degree oven for 12-14 minutes until perfectly golden brown. Let cool.
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6
Sift confectionery sugar on top of the cookies and transfer to a platter. A child will feel love, while a grandmother honor.