INGREDIENTS
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3 tablespoons butter, room temperature
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3/4 cup granulated sugar, divided
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2-3 fresh lemons, zested and juiced (about 1 tablespoon zest and 1/2 cup juice)
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3 large eggs, separated
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1/4 cup all-purpose flour
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1 teaspoon vanilla extract
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1/8 teaspoon salt
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1 cup milk
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1/8 teaspoon cream of tartar
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2 quarts boiling water