Ingredients

• 1 large egg
• 1 teaspoon distilled white vinegar
• 2 ½ cups all-purpose flour
• 2 tablespoons white sugar
• 1 teaspoon salt
• ¾ cup cold unsalted butter, cut into small cubes
• 7 tablespoons ice water, more as needed
• 1 apple, peeled and cut into 1/2-inch thick slices
• 6 cups fresh blackberries
• ½ cup white sugar, more as needed