I call this drink Christmas Passion, having witnessed its efficacy first hand.
This is a traditional recipe, the richest recipe I know, a surefire crowd pleaser. This is about enough for four servings.
3 egg yolks
½ cup sugar 125 mls
2/3 cup dark rum 150 mls (I like Gosling’s but other people use amber rum, brandy or Canadian Whisky.)
1/3 cup Kahlua liqueur (100 mls)
1 cup whipping cream 250 mls
Beat the egg yolks with the sugar. Add the rum slowly, 15 mls at a time. When it is smooth, fold in the whipping cream, unwhipped or very slightly whipped. Pour into glasses, and grind a pinch of nutmeg (not too much!) on top.
If this seems too much for you, you can also make it lighter by using half and half cream (10% BF) or even skim milk. You can also whip the egg whites and beat them in, to diminish the booze ratio if you like. Personally, I advise to make the recipe as written.