Blueberry Slab Pie recipe

Ingredients

• 1 cup ice water
• 2 tablespoons cider vinegar
• 4 cups all-purpose flour
• 1 cup almond meal
• 3 tablespoons granulated sugar
• 1 tablespoon kosher salt
• 2 cups (1 pound; 4 sticks) unsalted butter, cut into small pieces and cold
• 6 small to medium peaches, pitted and chopped (about 6 cups)
• 2 cups blueberries
• 1/4 cup granulated sugar
• 1/4 cup cornstarch
• Juice of ½ lemon (about 1 tablespoon)
• 1/4 teaspoon kosher salt
• All-purpose flour, for dusting
• 1 large egg lightly beaten with 1 tablespoon water
• 3 tablespoons turbinado sugar (sugar in the raw) or granulated sugar