Nigella says: "I don't think a cook's job should be to deceive, but there is something appealing about the fact that this looks and tastes as if it were incredibly hard work and yet involves not more than a bit of stirring. You must, though, serve a warm sauce with it - it's the crowning glory - and I've certainly given you options below. To be frank, you can choose different biscuits/cookies, different nuts and different nubbly bits generally to mix in with the ice cream and give crunch, texture and sudden shards of flavour. I find it hard to believe, however, that this could be in any way improved. Sorry, but that's just how it is". Cook time is freezing time.