"Use any combination of red or black grapes to achieve a deep purple color...."
INGREDIENTS
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3 cups all-purpose flour plus more for surface
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1 tablespoon sugar
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1 1/2 teaspoons kosher salt
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1 cup (2 sticks) chilled unsalted butter, cut into 1/2" cubes
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1/2 cup vegetable shortening
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3 pounds tart, crisp apples (such as Crispin or Pink Lady), peeled, quartered, cored, thinly sliced
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1 pound red or black grapes, halved, seeded if needed
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3/4 cup plus 2 tablespoons sugar
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2 tablespoons all-purpose flour
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Vanilla ice cream (optional)