Citrus mascarpone semifreddo with Manjimup walnut & cacao nib dukkah (Russel Blaikie)

Name: Citrus mascarpone semifreddo with Manjimup walnut & cacao nib dukkah (Russel Blaikie)
Prep time: 25 min
Cook time: 13 h
Total time: 13 h
Yield: 12 portions
Ingredients: 250 g sugar; 1 lemon; 1 orange; 8 egg yolks; 500 g mascarpone cheese; 150 g pouring (whipping) cream; 40 g shelled unsalted pistachio nuts; 40 g walnuts; 30 g Rapadura sugar; &frac18; tsp ground cinnamon; 1 orange; 20 g sesame seeds; 20 g pepitas; 60 g buckinis; 60 g raw cacao nibs; fresh berries