"Granny Smith apples are the key to this crisp, because their tartness is delicious with the sweet, crunchy oat-flecked crumb topping...."
INGREDIENTS
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3 pounds Granny Smith apples—peeled, cored and thinly sliced
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2 tablespoons freshly squeezed lemon juice
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1/2 cup granulated sugar
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1 stick unsalted butter, finely diced and chilled, plus 2 tablespoons
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1 1/2 cups all-purpose flour
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1 1/2 cups light brown sugar
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3/4 cup rolled oats (not quick-cooking)
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1 teaspoon ground cinnamon
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1/2 teaspoon fine sea salt
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Scant 1/2 teaspoon ground cardamom
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Crème fraîche or vanilla ice cream, for serving