Set the puff pastry out from the freezer for about 15 minutes prior to using them.
Preheat the oven to 400 degrees F and line a baking sheet with parchment paper.
In a medium saucepan, add the strawberries, sugar, water, cornstarch, and vanilla over medium heat.
Cook for about 5 minutes, breaking it up as it cooks with a fork. The strawberries should break down as they cook and the mixture with thicken up as it cooks.
Lay out both puff pastry sheets on a flour dusted surface. Lightly roll them out with a rolling pin to flatten out the creases.
Cut each sheet into four squares.
Add ~2 tablespoons of filling to the middle of each square. Dip your finger in a bowl of water and run it along the edges of the puff pastry and then fold one corner over to form a triangle.
Use a fork to seal the edges and place on parchment paper lined baking sheet.
Using a pastry or silicone brush, brush the egg white lightly over each turnover.
Bake in the preheated oven for about 15 minutes - until golden.
Make the glaze by whisking together the powdered sugar, milk, vanilla and salt.
Drizzle the glaze over the turnovers.
Enjoy!