Deep Dish Apple Pie

Ingredients

• 2 1/2 cups all-purpose flour (12 1/2 ounces), plus more for work surface
• 1 tsp salt
• 1 tbsp sugar
• 16 tbsp unsalted butter (2 sticks), cold, cut into 1/2-inch cubes
• 3 tbsp sour cream
• 1/3 cup ice water, or more if needed
• 2 pounds Granny Smith apples (4 medium)
• 2 pounds Golden Delicious apples (4 medium)
• 3/4 cup granulated sugar
• 1 1/2 tbsp lemon juice
• pinch of salt
• 1/4 to 1/2 tsp ground cinnamon
• 1/8 tsp ground allspice
• 1 to 2 tbsp cornstarch
• 1 egg white, beaten lightly
• 1 tbsp granulated sugar, for topping