For the pastry: Place dry ingredients into a food processor with cubes of butter. Blitz until mixture resembles fine breadcrumbs. Add the egg, vanilla and water and blend until it all comes together to form a soft dough.
Shape in a ball and flatten slightly. Wrap and chill for at least 2 hours or even overnight.
Place all the strawberry filling ingredients into a bowl and gently mix until evenly combined and coated.
Preheat oven to 180 Degrees Celsius.
Roll out chilled pastry (1 cm thick) onto baking paper and transfer onto a baking tray.
Arrange strawberries onto the pastry, leaving a generous border around the apples. Fold the edges inwards.
Brush pastry edges generously with beaten egg.
Bake for +- 30 minutes. The pastry should be golden and crisp and the strawberries should be soft with a bit of viscous strawberry sauce oozing out.
Dust with icing sugar and serve with clotted cream, whipped cream or vanilla ice-cream.