Melt the fat in a pot. Finely chop the pistachios. Sieve the icing sugar into a mixing bowl. Add butter, pistachios, almonds, flour, egg white, tea powder, sugar and melted butter to the icing sugar and mix to a smooth dough.
Grease the troughs (12 troughs of 25 ml each) of a mini-pizza tray. Spread the dough evenly in the trays and sprinkle with cranberries. Bake in the preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for 10-12 minutes.
Remove the tray from the oven. Remove cookies from the tin and let them cool on a cake rack. Dust with icing sugar before serving.