Strawberry Elderflower Lattice Pie

Name: Strawberry Elderflower Lattice Pie
Ingredients: 3 3/4 cup of all-purpose flour; 2 tablespoon of granulated sugar; 3/4 teaspoon of salt; 340 gram of cold butter, chopped into pieces (I used salted butter, but you can use unsalted butter); 8 tablespoon of cold water; 2 tablespoon of elderflower cordial; 700 gram of strawberries, hulled and quartered; 1/2 cup of granulated sugar; 1/4 cup of packed brown sugar; 1 vanilla bean or 2 teaspoons of vanilla essence; 1/4 cup of cornstarch; 1 pinch of salt; Egg wash; Granulated sugar for sprinkling on the lattice top