Preheat the oven to 350 degrees F.
Spread the walnuts on a baking sheet and toast for 10 minutes.
Increase the oven to 400 degrees F.
Place the frozen pastries on a baking sheet lined with parchment paper. Bake until puffed, 20 to 25 minutes.
Meanwhile, in a bowl, add the strawberries, balsamic and maple syrup. Mix.
While the pastries are still hot, stuff with the cheese, and then top with walnuts, strawberries and some pepper. Serve hot.
Recipe courtesy of Nadia G