Melt the chocolate in a heatproof bowl over a pan of simmering water then leave to cool for 10 minutes.
Beat the egg yolks, sweetener and rum into the cooled chocolate.
Whisk the egg whites until just stiff but not too dry then fold into the chocolate.
Transfer the mixture into small serving glasses (shot glasses are ideal) and chill for 1 hour or until set.
Recipes taken from A Slimming World Christmas, which is available from all Slimming World groups at the price of £4.95/€7.95. To find your nearest Slimming World group visit our website or call 0844 897 8000. Photos: A Slimming World Christmas/Lara Holmes.