Spread a thin layer of semolina (or ground almond), leaving 2 cm empty all around.
Rinse, cut in half and pit plums
Place them on semolina, cut side facing up.
Lightly sprinkle brown sugar over fruits.
Roughly fold the edges of the pie pastry over the fruit as in the photos.
In a bowl, beat an egg as for an omelet and with a pastry brush (or your fingers!) brush the folded edges of the dough with beaten egg. Egg can be replaced by liquid cream.
Bake at 180 °C / 350°F for about 30 minutes until the pie crust is baked.
Notes
The main steps: Roll out pie pastry, cover with semolina, arrange fruits and sprinkle sugar. Fold edges, brush with beaten egg and bake.