INGREDIENTS
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2/3 cup sugar
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8 large egg yolks
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1 large whole egg
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1 1/2 tablespoons finely grated lemon zest (from 2 lemons)
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1/2 cup all-purpose flour
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1/2 cup cornstarch
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Pinch of salt (edited to add this)
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2 sticks (1/2 pound) unsalted butter, melted and cooled a bit
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1/2 cup poppy seeds (I got this from one 3-ounce spice bottle