For the double pie crust, first mash the flour, margarine and salt with a fork until a finely crumbly mixture is formed. Mix the egg and ice water and stir quickly into the dough with a fork and stir briefly by hand. Divide into 2 parts (1 part as the base, 1 part as the lid of the pie) and chill.
In the meantime, mix the sugar, cornstarch, salt and cinnamon for the filling and mix with the berries.
Now roll out the dough, use the first half to line a springform pan and add the filling. Then put the lid on the pie. The pie is baked in the lower part of the oven at 200 ° C for about 50 minutes until it is golden brown.
It tastes best fresh out of the oven, thanks to the cornstarch, the filling does not run.