INGREDIENTS
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shortbread base
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1 1/2 sticks unsalted butter, cut into 1/2-inch pieces
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2 cups all-purpose flour
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1 cup confectioner’s sugar
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1/2 teaspoon salt
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custard
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4 large eggs
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1 1/2 cups granulated sugar
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3/4 cup key lime juice
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1/3 cup all-purpose flour
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3 tablespoons confectioners sugar
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Topping
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1 lime sliced