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Cream the butter and sugar together using an electric whisk until really light and fluffy. Add the eggs one at a time and beat well between each addition. Don’t worry if the mix has curdled slightly, it will come together again when you add the other ingredients. Mix in the cocoa powder, Prosecco and sea salt.
Put the chocolate in a heatproof bowl over a pan of simmering water and turn off the heat. Leave to melt slowly, stirring now and then, until silky smooth. Remove the bowl and leave to cool slightly, about 5 mins. Beat the chocolate into the egg mixture until fully incorporated. Fold through the biscuits, nuts and dried fruit.
Put a large double layer of cling film on a clean work surface that has been wiped with a damp cloth (this will help the film to stick). Spoon the chocolate mix into the centre of the film – you need a rough sausage shape about 30cm long. Wrap the sausage in the cling film, pushing against the work surface to make it quite tight. Once completely covered, hold the ends of the cling film and roll the salami as if it were a rolling pin to help tighten the wrap. Tie the ends into a knot, then chill for at least 8 hrs, preferably overnight.
When ready to serve, unwrap the cold salami and, if you want to decorate, tie loosely with string. Dust generously with icing sugar. Place on a board in the middle of the table and cut into thick slices to share. Keep leftovers (if there are any!) chilled.
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