Cut the butter into pieces and let it warm to room temperature.
Break the chocolate bar into pieces and put them into a small bowl. Melt the chocolate using the bain Marie method.
While melting the chocolate, stir with a spoon to be sure that there are no lumps. When the chocolate is completely melted, set the bowl aside and let the chocolate cool a little.
Put the biscuits into a large bowl.
Break the biscuits using the back of a spoon; make them into crumbs.
When the butter is soft, work it with an electric whisk for few seconds and then start adding the ingredients as shown next (you can add all these ingredients without stopping to whisk).
Add the sugar.
Add the eggs.
Whisk for few seconds.
Add the melted chocolate.
Whisk for few seconds.
Add the rum and whisk again for few seconds.
Pour the mixture into the large bowl containing the biscuit crumbs. If using citrus peel, add this now.
With a spoon, work the mixture until all the biscuit crumbs are completely coated with the chocolate mixture.
The result should be a chocolate dough.
Take the dough and make the shape of a salami. Put the chocolate salami onto a layer of cling film and then wrap it with the film.
When wrapping, press the chocolate salami to make it compact. Then seal the sides and put the chocolate salami in the fridge for a couple of hours.
After a couple of hours, you can slice your chocolate salami and serve it with coffee or tea.
Enjoy it!