This is another of my maternal grandmother's recipes. I've changed it a bit, not least substituting dark rum for her juice and zest of an orange and a slug ot two of Grand Marnier. It's not that I didn't like her version, but it was just a bit too much like a homespun Terry's chocolate orange for comfort. You do as you please.
It's incredibly easy to make, and dangerously compelling to eat, one of those puddings about which everyone says 'it's very rich' before going on to third helpings.
Recipe posted by Nigella