"Semolina is a coarse-ground flour made from durum wheat. Look for it in the baking section of your supermarket or health-food store...."
INGREDIENTS
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12 tablespoons (1 1/2 sticks) unsalted butter, room temperature, plus more for pan
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1 2/3 cups sugar
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1/2 cup water
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6 wide strips orange zest, plus 1 tablespoon finely grated zest
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3/4 cup semolina flour
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3/4 cup all-purpose flour (spooned and leveled)
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1/2 cup blanched almonds, finely ground in a food processor
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1 teaspoon baking powder
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1/4 teaspoon salt
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2 large eggs, plus 1 large egg yolk
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1 teaspoon pure vanilla extract
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1 cup Greek yogurt (full-fat), plus more for serving