I adapted this from a Nigella recipe so you can pretty much add what you like. The original is marshmallows but I only had sultanas and nuts in the house.
Dark Chocolate Fruit and Nut Slice
125g soft butter
300g dark chocolate (minimum 70% cocoa solids), broken into pieces
3 x 15ml tablespoons golden syrup
200g Rich Tea biscuits, bashed or food processed
100g sultanas & mixed nuts (crushed)
2 teaspoons icing sugar for dusting (optional)
Aluminium tray - 24cm square (disposable BBQ ones are great cause you can throw them out afterwards and the slice comes out easily.
Melt chocolate and golden syrup in a saucepan.
Scoop out about 1 ladle of this melted mixture and put to one side.
Fold the biscuit pieces and crumbs into the melted chocolate mixture in the saucepan, and then add the nuts and sultanas. Tip into a foil tray , flatten as best you can with a spatula (i used my fingers).
Pour the reserved of melted chocolate mixture over the buscuit mixture and smooth the top.
Refrigerate for about 2 hours or overnight.
Remove from tray.
Cut into 24 fingers and dust with icing sugar by pushing it gently through a tea strainer or small sieve.