Salted Caramel Apple Pie

Ingredients

• 16 TB (226g/8 oz) cold unsalted butter, cut into 1/2 inch chunks
• 2.25 cups + 2 TB280g10oz all-purpose or pastry flour
• 1 tsp kosher salt
• 2 tsp sugar
• 1/4 tsp baking powder-
• 1 tablespoon apple cider vinegar
• 7-9 tablespoons ice water
• 1 egg, beaten
• 2-3 teaspoons coarse sugar (optional)
• 11 full cups (1.5 kg/3.5 lbs) Granny Smith apples
• 1 tablespoon lemon juice
• 1/4 cup light brown sugar, packed
• 1/4 cup granulated sugar
• 1/4 teaspoon ground cinnamon
• 1/4 teaspoon ground nutmeg
• 2.5 tablespoons cornstarch
• 2 tablespoons unsalted butter
• 3/4 cups (187g/6oz) granulated sugar
• 1/8 cup (30g/1oz) water
• 3/4 cup (174g/6oz) heavy cream
• 1 tablespoon (14g/0.5oz) unsalted butter
• 3/4 teaspoon kosher salt