Melt butter in a pot and spread it on the filo leaves. Roast the pistachios in a pan without fat. Take them out, let them cool down a bit and chop them into small pieces. Coarsely chop 50 g chocolate.
Spread the filo sheets with butter and place 2 sheets on top of each other. Divide leaves into six. Place 3-4 raspberries, pistachios and chopped chocolate on each round edge, leaving 1-2 cm space on each side.
Roll up the nems, folding the edges towards the middle. Place on a baking tray lined with baking paper.
Bake Nems in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 10-15 minutes until golden brown. Remove and let cool slightly. Coarsely chop 100 g white chocolate. Melt the chocolate and coconut oil slowly in a bowl over a warm water bath.
Dust the nems with icing sugar before serving. Add the chocolate sauce.