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Preheat oven to 400 degrees fahrenhet.
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Whisk the shortening in a large bowl until light and aerated. Use an electric mixer if possible.
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Gradually beat in the granulated sugar.
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Grate the rind of the orange onto a plate and squeeze juice into a cup. Be careful to remove any seeds from the juice.
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Whisk the eggs, orange rind and orange juice into the shortening mixture and continue for 3 to minutes after combined.
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Sift flour together with baking powder in a separate bowl.
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Stir the flour mixture and almonds into the shortening mixture until it forms a dough.
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Lightly flour a flat surface and roll out the dough until it's about 1/2-inch thick.
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Use a round cookie cutter to cut out 36 round cookies and place them on baking sheets.
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Bake for 10 minutes at 400 degrees F until golden.
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Remove from oven and allow to cool and firm on baking sheets for about 10 minutes.
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Mix confectioner's sugar with cinnamon and sift this mixture evenly over the baked cookies as they cool.