INGREDIENTS
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Meringues:
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4 large egg whites, at room temperature
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1/2 teaspoon cream of tartar
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1/4 teaspoon fine salt
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2 1/4 cup confectioners' sugar
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Curd:
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3 large egg yolks
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2/3 cup sugar
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Finely grated zest of 1 lemon, plus 1/4 cup fresh lemon juice (from 2 lemons)
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1/2 stick cold unsalted butter, diced