Amazing Apple Pie Just Like Granny Made The Proper - My Recipe Critic

Ingredients

• 2 ½ cups All-Purpose Flour (chilled)
• 1 Tbsp Granulated Sugar (for crust)
• 1 tsp Fine Sea Salt
• 1 cup (2 sticks/225 g) Unsalted Butter (cubed, very cold)
• ½ cup Ice Water (approx. 120 ml)
• 4 large Tart Apples (e.g., Granny Smith), peeled, cored, and sliced ⅛-inch thick
• 4 large Sweet Apples (e.g., Honeycrisp or Fuji), peeled, cored, and sliced ⅛-inch thick
• ½ cup Light Brown Sugar (packed)
• ¼ cup Granulated Sugar (for filling)
• 3 Tbsp All-Purpose Flour (or Cornstarch)
• 2 tsp Ground Cinnamon
• ½ tsp Freshly Grated Nutmeg
• 1 Tbsp Lemon Juice (freshly squeezed)
• 1 Tbsp Unsalted Butter (for dotting)
• 1 Large Egg (beaten lightly, for wash)
• 1 tsp Milk or Heavy Cream (for wash)
• 1 Tbsp Demerara Sugar (for finish)