INGREDIENTS
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1 partially baked 9-inch Great Unshrinkable Tart Shell, or your favorite sweet tart shell
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1 average-sized lemon (about 4 1/2 ounces; 130 grams), rinsed and dried*
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1 1/2 cups (300 grams) sugar
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1 stick (4 ounces or 115 grams) unsalted butter, cut into chunks
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4 large eggs
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2 tablespoons (14 grams) cornstarch
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1/4 teaspoon table salt