Finnish Berry Pie

Instructions

1. Prepare the dough
   In a large bowl, combine flour, 1/4 cup sugar, and salt. Cut in the cold butter using a pastry cutter or your fingers until the mixture resembles coarse crumbs. Add the egg and mix until the dough comes together. Form into a disk, wrap in plastic wrap, and refrigerate for at least 30 minutes.
2. Mix the berry filling
   In a large bowl, gently combine all berries with the remaining 1/4 cup sugar, potato starch, lemon juice, vanilla extract, and cardamom. Toss carefully to avoid crushing the berries. Let the mixture stand for 10 minutes to allow flavors to meld.
3. Prepare the crust
   Preheat oven to 375°F (190°C). Roll out about 2/3 of the dough on a floured surface to fit a 9-inch pie dish or tart pan. Press the dough into the pan, trimming any excess from the edges. Reserve the remaining dough for the lattice top.
4. Assemble the pie
   Pour the berry mixture into the prepared crust. Roll out the remaining dough and cut into strips for a lattice top, or crumble it over the berries for a traditional Finnish-style topping. Sprinkle with the remaining 2 tablespoons of sugar.
5. Bake the pie
   Place the pie on a baking sheet (to catch any drips) and bake in the preheated oven for 35-40 minutes, until the crust is golden brown and the filling is bubbling. If the edges brown too quickly, cover them with aluminum foil.
6. Cool and serve
   Allow the pie to cool for at least 1 hour before serving to let the filling set. Serve at room temperature with a dollop of whipped cream or a scoop of vanilla ice cream for an authentic Finnish dessert experience.