Wash the orange hot, dry it and peel off an approx. 7 cm long piece. Squeeze the orange. Mix 500 g flour, baking powder, gingerbread spice and brown sugar. Add oil, about 5 tbsp. water, 100 ml orange juice and rum. Knead everything with your hands to a soft dough.
Preheat oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Line baking tray with baking paper. Form approx. 50 walnut-sized balls from the dough with floured hands. Place 25 balls on the baking tray and bake in a hot oven for 20-25 minutes. Bake the remaining balls in the same way.
When the first tray is in the oven, bring sugar, honey, 200 ml water, cinnamon stick and orange peel to the boil. Simmer for about 3 minutes. Keep syrup warm. Finely chop and mix walnuts, rose petals and pistachios. Remove the cookies and add them in portions to the syrup for 3-5 minutes. Lift out, drain and turn in the nut mixture. Let them cool down.