1.Combine raisins and figs in a bowl, pour in rum, cover with plastic wrap, and leave at room temperature overnight to soak.
2.Preheat oven to 160°C. Grease a 22cm-diameter cake tin and line with baking paper. Combine chocolate, nuts and orange peel in a large bowl. Beat butter, sugars and vanilla in an electric mixer fitted with the paddle attachment until pale and fluffy. Scrape down sides and bottom of bowl with a spatula and beat briefly to ensure everything is well combined. Add egg a little at a time, beating between additions and scraping down sides of bowl occasionally, until incorporated. Fold in nut mixture, soaked fruit and rum, lemon zest and honey, then add flour and fold to combine well.
3.Pour batter into prepared tin, smooth top, and bake until golden and centre of cake springs back when lightly pressed (40-50 minutes; it may feel slightly undercooked, but the chocolate will firm up as the cake cools.
4.Cool in tin then turn out and cool completely. Decorate with gold leaf. Cake will keep in an airtight container for 5 weeks.