Delicious Bake Triple Berry Pie - A Summer Delight

Ingredients

• 2 ½ cups (313 g) all-purpose flour
• 1 tsp (5 g) salt
• 1 tbsp (12 g) granulated sugar
• 1 cup (227 g) unsalted butter, cold and diced
• 6-8 tbsp (90-120 ml) ice water
• 2 cups (300 g) fresh blueberries
• 2 cups (300 g) fresh strawberries, hulled and quartered
• 2 cups (250 g) fresh raspberries
• ¾ cup (150 g) granulated sugar
• ¼ cup (30 g) cornstarch
• 1 tbsp (15 ml) lemon juice
• 1 tsp (5 g) vanilla extract
• 1 egg (for egg wash—optional)