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Pre-heat the oven to 325 degrees F.
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Grind the Brazil nuts finely.
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Beat the butter until fluffy, add the sugar and beat until fluffy again--do beat adequately.
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Sift in the flours and the nuts and work to a smooth dough.
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Cover a baking sheet with parchment.
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place a 6" flan ring or tart form on the cookie sheet to use as a guide.
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Press the dough onto the sheet inside the ring to form a neat 6" inch circle.
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Remove the ring and flatten the dought slightly with a rolling pin.
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Prick the circle of dough with a fork and score it into eight wedges.
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Sprinkle with a little granulated sugar and bake for forty minutes.
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Remove from the oven and cut along the score lines and leave to cool for two minutes.
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Lift onto a rack and cool completely.
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If they don't get immediately eaten, store in an airtight container.