Ingredients
Method
- Crush the digestive biscuits by hand or in a zip-lock bag using a rolling pin. You want a mix of fine crumbs and pieces up to 1 cm, not uniform powder.
- Beat the softened butter and icing sugar together with a wooden spoon or hand mixer until pale and smooth, about 2 minutes.
- Add the cocoa powder and mix until fully incorporated and the mixture is dark and uniform.
- Add the egg yolks one at a time, mixing well after each. The mixture should look glossy.
- Stir in the rum and vanilla extract.
- Add the crushed biscuits and fold everything together with a spatula until all the pieces are coated in the chocolate mixture.
- Lay a large sheet of plastic wrap on your work surface. Spoon the mixture onto the center and shape it roughly into a log about 20 cm long.
- Roll the plastic wrap tightly around the log, then twist both ends firmly to compact it into a round salami shape. Knot or tuck the ends.
- Refrigerate for at least 4 hours, or overnight for best results.
- Before serving, unwrap the log and dust it generously with icing sugar through a fine-mesh sieve. Slice into 1 cm rounds with a sharp knife and arrange on a board.
Notes
For the sharpest visual effect, keep some biscuit chunks as large as 1 cm so the sliced cross-section has clear pale 'fat' pieces against the dark chocolate background.
