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1
Mix flour, 2 tablespoons sugar, and salt together with an electric mixer until combined. Mix in butter until mixture resembles coarse meal. Add ice water, 2 teaspoons at a time, while the mixer is running until dough just holds together. Test dough by pinching a small amount between your fingers; if it is crumbly, add a 1 teaspoon more ice water at a time.
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2
Wrap dough in plastic wrap and chill until slightly firm, 20 to 30 minutes.
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3
Preheat oven to 350 degrees F (175 degrees C).
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4
Squeeze 1/2 the lemon over the apple slices to keep from browning.
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5
Place a large piece of parchment paper on a flat work surface. Roll dough into a round 12 to 16 inches in diameter, 1/4 to 1/2-inch thick. Arrange apple slices in 2 layers on the dough, leaving a 1 1/2 to 2-inch border all around. Fold up the border, pleating the edge to make it fit; leave most of the apples uncovered.
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6
Combine 1/2 cup sugar and cinnamon in a small bowl. Sprinkle over apples. Squeeze remaining 1/2 lemon over apples. Sprinkle 2 teaspoons sugar over crust. Transfer parchment paper to a baking sheet.
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7
Bake in the preheated oven until crust is golden brown, 50 to 60 minutes.
