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Pour flour on cutting board. Add margarine and sour cream. Cut the mixture with a wide knife until it becomes thick dough. Do not touch with hands.
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-Refrigerate the dough overnight.
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-Sauté mushrooms and onion in margarine until soft.
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Cool, then place them into a bowl and add grated cheese, salt, and pepper. Mix well.
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Take the dough out of the refrigerator. Roll it out to a thickness of about 1/8".
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Cut the dough into 4" squares.
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Fold each of the squares diagonally until there is a crease in the dough. Unfold and lay flat.
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Spoon 1 Tbls. of filling on half of each square.
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Fold the square diagonally along the crease, making sure the filling does not fall out.
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Pinch the sides until there are no gaps in the dough.
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Repeat until all of your dough and mixture has been used.
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Put the triangles on a baking pan.
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Beat the egg yolk in a bowl with a hand mixer.
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Brush the top of the triangles with the beaten egg yolk.
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Sprinkle the top of the triangles with caraway seeds.
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Bake in 350 degree oven for 20 minutes, or until golden brown.