Preheat the Oven: Set your oven to 375°F (190°C).
Mastering the Crust:
o In a large bowl, combine the all-purpose flour and a pinch of salt.
o Add the cubed unsalted butter and, using a pastry cutter or your fingertips, blend the ingredients until they resemble coarse crumbs.
Crafting the Filling:
o In a mixing bowl, gently combine the sautéed fish, mixed berries, cherry tomatoes, baby spinach, feta cheese, and fresh dill.
The Velvety Sauce:
o In a saucepan, melt the unsalted butter over medium heat.
o Add the all-purpose flour and whisk continuously until a roux forms.
o Gradually pour in the whole milk, whisking continuously to avoid lumps.
o Stir in the Dijon mustard, salt, and pepper. Continue stirring until the sauce thickens to a velvety consistency.
Assembling the Culinary Creation:
o Roll out the chilled dough to fit your pie dish.
o Gently press it in, leaving some overhang.
o Pour the filling into the crust.
o Ladle the creamy sauce over the top, ensuring an even distribution.
o Fold the excess dough over the filling, creating a rustic edge.
o Bake in the preheated oven for 35-40 minutes or until the crust is golden brown.