"Key limes can now purchased at well-stocked markets during their winter and early spring season, but regular limes work, too...."
INGREDIENTS
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1 1/2 cups graham cracker crumbs
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4 large egg yolks
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2 tbsp sugar
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3/4 cup heavy cream
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5 tbsp butter, melted
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2 tbsp confectioner's sugar
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15 key limes or 6 limes
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1/2 tsp pure vanilla extract
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one 14 oz (400 g) can condensed milk