in a bowl mix together flour, sugar, salt and butter
Incorporate the butter with flour, do it by pressing the butter with a fork until crumbs formed
Gradually add 4 tbsp of iced water and stir, add another 1-2 tbsp if nedded. when the water is incorporated start to knead and form disc. Warp the dough in plastic wrap and refrigerate at least 30 min.
slice the strawberries into 2-3. Transfer them to a large bawl. Add sugar, corn starch, lemon zest and vanilla extract. Mix well
Preheat the oven to 400°F (200°C)
on a floured baking parchment roll out the dough to 12-14in/30-35cm
Arrange strawberries in circles starting in the center of dough, leave a 1.5-2in/3.8-5cm border, Fold edges, overlapping slightly. Brush dough with beaten egg
Bake until crust is golden brown and strawberry filling is bubbling. About 35-45 minutes.
*you can see full video recipe on my youtube channel: the cooking foodie. link in my profile