Put flour, salt, cane sugar, and cinnamon in a food processor along with the butter and process until sandy.
Add egg, vinegar, and water and mix briefly.
Pour out onto your work surface and knead everything briefly into a ball.
Roll the dough evenly between 2 sheets of baking paper to a thickness of 2 to 3 mm.
Carefully remove the top sheet of baking paper.
Slice the strawberries into thin slices, mix them in a bowl with sugar, vanilla, and cornstarch well together and place evenly in the center of the dough, about 5 cm away from the edge, fold the sides of the dough over the strawberries using the baking paper you lift and press down a bit.
Brush the edges with beaten yolk and sprinkle with cane sugar.
Bake for 40 minutes at 185-190°C.
Brush the juice from the strawberries over it so it shines beautifully.
Let cool and serve.