1. In a medium bowl, add strawberries and sprinkle with sugar, orange juice, and cornstarch; gently stir to coat. Set aside for about 15 minutes.
2. On a floured surface, roll your dough out a bit, set onto a parchment lined baking sheet; set aside.
3. Spoon strawberries and juice into the center of the dough, leaving about 1.5-2 inches at the edges (so you have dough to fold up and over).
4. Fold dough up and over the sides of the strawberries, working your way all the way around.
5. In a small bowl, add egg and water; whisk quickly for 15-30 seconds or until frothy. Using a pastry brush, brush egg wash over all visible dough. Sprinkle dough/egg wash with a light layer of sugar. Add butter pieces to the top of the strawberries, scattering around.
6. Place into middle of oven, and bake for 20-25 minutes or until crust is beginning to brown and strawberries are bubbly.
7. Allow to cool for 20 minutes, slice, and serve!