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In a large bowl, mix flour and sugar. With pastry blend, cut in butter until mixture resembles coarse crumbs.
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Stir in sour cream and egg yolks until well blended.
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Turn dough onto lightly floured surface and knead until it holds together.
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Shape into a ball; wrap with plastic wrap and refrigerate 2 hours.
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Prepare Apricot Filling; cover and refrigerate until chilled.
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Preheat oven to 375 and grease cookie sheets.
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Roll 1/4 of dough 1/8" thick, keeping remaining dough refrigerated. Cut dough into 2" squares.
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Place 1/2 teaspoon filing diagonally across each square.
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Moisten 2 opposite corners slightly with water; fold over filling, overlapping corners slightly. Place on sheet and finish the rest.
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FILLING:.
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In a 1 quart saucepan over medium-high heat, heat apricots and water until boiling.
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Reduce heat to low; over and simmer 5 minutes. Drain.
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In a blender at medium speed blend apricots and corn syrup until smooth. Let chill.