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For Crust:.
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Pulse almonds in food processor until finely chopped.
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Mix with the butter and sugar. Press into pan going up about 1/2 inch up the sides.
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Bake for 10 minutes at 350 degrees.
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Turn oven down to 300 degrees after crust is baked.
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For Filling:.
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Cream together the creamcheese, sugar, and lime juice.
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Add the eggs one at a time, mixing well after each one.
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Add the zest and cornstarch.
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Pour mixture into crust. Bake for one hour.
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Let cool for 10 minutes.
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For Topping:.
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Stir together the sour cream, sugar and lime juice.
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Drop the topping onto cake and smooth evenly.
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Bake for 10 minutes.
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Cool completely then refrigerate for at least 2 hours before serving.