INGREDIENTS
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1 1/4 cup unbleached white flour
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1/4 teaspoon salt
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8 tablespoons frozen unsalted butter, cut into pieces
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1/4 cup plain Greek yogurt
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1/4 cup ice cold water
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2 teaspoons lemon juice
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2 to 3 large apples, peeled and sliced into 1/4 inch slices (about 4 cups)
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1/4 cup packed dark brown sugar
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1 heaping tablespoon all-purpose flour
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1 teaspoon cinnamon
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1/4 teaspoon nutmeg
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1/4 cup finely chopped raw walnuts (optional)
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1 egg yolk
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1 teaspoon water
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2 tablespoons butter
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1/4 cup maple syrup
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1/3 cup powdered sugar
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1 teaspoon vanilla
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pinch of flaky sea salt, such as Maldon's