Start by preheating the oven to 180ºC. Roll out the dough into a removable round mold and pierce it with a fork. Put it in the freezer for ten minutes and bake it for fifteen minutes. Remove it from the oven and in the meantime, prepare the filling.
Beat the butter in a bowl at room temperature with the sugar, eggs, ground almonds and a tablespoon of normal flour. Spread over the base of the cake, add the blackberries over the entire surface.
Sprinkle the sliced almonds on top and bake for 20 minutes approximately or until you see the golden surface.