It's the time of year for marmalade, which I love and make religiously every January when Seville oranges come into season. So much so, I've written a book about it. If you want to try making a batch, seek out Marmalade: A Bittersweet Cookbook (Saltyard Books, £20). Or, if you just want the flavour, try this quick, easy cake – it may well give you the marmalade bug.