For the filling:
In a bowl, mix the flour, semolina, baking powder, water and blossom water with an electric mixer for 2 minutes. Leave the batter to rest for 30 minutes.
Using a heavy-based pan or griddle, pour a little batter on the hot surface until you get a circle of the size you want. Wait a few seconds until the base of the dough is golden and remove from the heat.
Leave the qatayef to cool completely.
Press the sides of each piece together firmly from the centre downwards and then fill the cavities with Nutella®.
Sprinkle with the ground pistachio and sugar syrup, and decorate with the candied blossom before serving.