INGREDIENTS
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Crust:
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7 tablespoons unsalted butter, melted
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2 tablespoons sugar
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3/4 teaspoon vanilla
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1/4 teaspoon salt
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1 cup unbleached all-purpose flour
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Topping:
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1 cup plus 2 tablespoons sugar
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3 tablespoons unbleached all-purpose flour
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3 large eggs
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1 1/2 teaspoons finely grated lemon zest, preferably from an organic or unsprayed fruit
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1/2 cup fresh lemon juice
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2 to 3 tablespoons powdered sugar, for dusting (optional)