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Cream together the butter and icing sugar.
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Break up the chocolate and melt either in a microwave or in a bowl over a pan of bowling water until completely melted and smooth. Allow to cool but not cool enough that is sets, about 5 mins should be enough.
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Pour the chocolate and rum in with the creamed butter and beat together, place in a fridge for about an hour so it goes firmer and easier to roll.
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Once cool enough, dust your hands with a little icing sugar and take pieces of the chocolate mix slightly smaller than a walnut, roll into balls and then roll in the chocolate sprinkles. Place on a plate or tray and chill for at least another half an hour to firm, they will be good to eat them but to get a firmer truffle texture leave overnight.