Preparation
1) Preheat oven to 400F.
2) Prepare 2 baking sheets with parchment paper and set aside.
3) Cut the pastry dough into 3 strips along the folding marks. Place on a baking sheet and make a couple of holes in each dough with a fork.
Bake for 15 minutes or until golden brown. Let it cool on a rack.
4) In a medium saucepan, place the milk and bring to a simmer. Meanwhile, in a small bowl, whisk together the sugar, cornstarch, and salt.
5) Gradually add the cornstarch mixture to the milk and cook, stirring frequently, for about 6 minutes or until thickened. Beat the yolks and cook for 2 more minutes, stirring frequently.
6) Add vanilla extract and butter, and remove from heat.
7) Let cool to room temperature, cover and refrigerate until ready to use.
Using a fork, divide each dough into 2 layers. Spread the pastry cream on 1 layer of cake, add our chopped strawberries. Repeat the layers.