Chop the pistachios a little finer. Put 1 tbsp. of pistachios aside. Knead 100 g butter, 60 g sugar, pistachios and 150 g flour into crumbles with your hands and chill. Drain pineapple rings and cut into small pieces.
Cut 125 g butter into pieces. Cream butter, vanilla sugar and 125 g sugar with the whisk of the hand mixer. Stir in the eggs one by one. Mix 175 g flour, cocoa and baking powder and stir in alternately with the rum. Fold in pineapple pieces. Line the hollows of a muffin tray with 1-2 paper baking cups each. Pour in the dough evenly and spread the crumbles on top. Bake on the middle shelf of a preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for 25-30 minutes (test with sticks). Remove the tray and let it cool down.
Fold in pineapple pieces. Line the hollows of a muffin tray with 1-2 paper baking cups each. Pour in the dough evenly and spread the crumbles on top. Bake on the middle shelf of a preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for 25-30 minutes (test with sticks). Remove the tray and let it cool down. Sprinkle with remaining pistachios
Waiting time approx. 30 minutes