In a non stick pan: add diced strawberries, cornstarch, sugar, lemon juice and mix. Turn up the heat to medium and cook for 5 minutes or until thickens. Stir occasionally. Remove the pan from heat source and transfer the strawberries to a bowl. Reserve about 1 tsp of strawberry sauce for the glaze. Let cool for 15-20 minutes.
Place parchment paper on a working surface (this will help prevent the puff sheets from sticking to the working surface). Unfold the puff sheet. Cut the dough into 3 long pieces. Add 2 Tbsp of strawberries filling to the dough. Fold and seal the dough edges together. Repeat with the other sheet.
Egg wash: In a small bowl: combine egg, water and whisk. Brush the egg wash on top of the pastries.
Transfer the pastries to a baking sheet (make sure to use parchment paper). Bake for 15 minutes or until golden. Remove from the oven.
Strawberry Glaze: In a small bowl: combine powdered sugar, milk, 1 tsp strawberry sauce and whisk until smooth.
Drizzle the strawberry glaze on top of the pastries. Serve & enjoy!