Apple Slab Pie with Maple Icing

Bahan-bahan (18 porsi)

• 4 cups (500g) all-purpose flour (spooned & leveled)
• 1 and 1/2 teaspoons salt
• 1 teaspoon granulated sugar
• 1 and 3/4 cup (396g) unsalted butter, very cold and cubed
• 3/4 cup (180ml) very cold ice water
• egg wash: 1 large egg, lightly beaten with 1 Tablespoon (15ml) milk
• optional: coarse sugar for sprinkling on top
• 10 cups peeled and chopped apples (about 4 – 5 lbs)*
• 2/3 cup (135g) granulated sugar
• 1/4 cup (31g) all-purpose flour
• 2 Tablespoons (30ml) fresh lemon juice
• 1 teaspoon pure vanilla extract
• 1 and 1/2 teaspoons ground cinnamon
• 1/4 teaspoon ground cloves
• 1/4 teaspoon ground nutmeg
• 3/4 cup (90g) confectioners’ sugar, sifted
• 2 Tablespoons (30ml) pure maple syrup
• enough milk or heavy cream to thin (a couple teaspoons)