Heat the fat in a saucepan and let it brown slightly. Pour into a mixing bowl and allow to cool. Roughly chop the dates. Add sugar, vanilla sugar and salt to the cooled fat and whisk until foamy.
Add the egg, juice and orange fruit and stir in. Add flour by the spoonful. Add the dates in portions and stir in. Finally, knead into a smooth dough with cool hands. Form into two rolls (approx. 4 cm Ø) and cover them and let them rest in the refrigerator for approx. 2 hours.
Spread the dough rolls with beaten egg white and turn them in pistachios. Cut into approx. 1 cm wide slices. Put the cookies on two baking trays lined with baking paper and press each one a little flat.
Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for 12-15 minutes. Let cool on a cake rack. Melt the couverture in a hot water bath and dip one corner of each taler in it.
Allow to dry. Results in about 50 pieces.