» California Grape and Apple Sheet Pan Pie

Ingredients

• 4 cups all-purpose flour
• 1 1/2 tablespoons sugar
• 2 teaspoons kosher salt
• 3 1/2 sticks cold unsalted butter, cut into 1/2-inch cubes
• 1 cup ice water plus additional if needed
• 3 pounds Granny Smith or other tart apples, peeled and thinly sliced (about 9 cups)
• 4 cups black California grapes
• 3/4 cup sugar
• 2 tablespoons all-purpose flour
• 2 tablespoons lemon juice
• Pinch of salt
• 1 egg
• Demerara sugar for garnish