If you can’t get hold of a chocolate Swiss roll, use chocolate brownies or any other chocolate cake instead. Plain trifle sponges will also work but the trifle won’t be quite as decadent.
This rich and creamy Yule log is not for the faint-hearted - it's a decadent triple-chocolate Christmas treat, but it's as easy as making ... turn the whole cake onto the sheet of paper, then ...