INGREDIENTS
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24 ounces all purpose flour
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2 teaspoons salt
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18 ounces cold unsalted butter, cut into cubes
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6-8 ounces ice cold water
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2 teaspoons apple cider vinegar
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1 pound rhubarb stalks
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2 medium baking apples, mutsus work well here
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1 vanilla bean
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4-6 tablespoons sugar
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juice of 1/2 lemon
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1 tablespoon unsalted butter
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2 tablespoons all purpose flour
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egg for egg wash
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crunchy sugar such as turbinado or demerara for sprinkling