To start the test. Put cold butter, sugar and flour cut into pieces in a food processor. Pour in the water and whisk. You should get the dough.
Attention, water and flour may need more or less.
Roll the dough into a ball and refrigerate for 20-30 minutes.
Preheat the oven to 180 degrees.
Cover the table with baking paper. Roll out the dough on paper with a thickness of 5 mm. Transfer the dough paper to a baking tray.
Finely chop the cookies and put them on the dough.
Remove the seeds from the plums, cut them into slices and put them on the cookies, leaving a rim of about 3-4 cm.
Sprinkle with sugar and cinnamon. Fold the edges of the dough onto the filling.
Brush the top of the dough with water and sprinkle with sugar.
Bake for about 45-55 minutes until soft and golden brown. The time may vary, take care of yourself.