St Clements polenta cake with blueberries

It uses whole, boiled citrus fruits, which are blitzed up in a processor with all the other ingredients and contribute a range of delicious, marmaladey flavours to the finished cake. I’ve added blueberries too, which burst juicily as you dig in with your fork. Boiling the fruit may sound like a fuss, but it’s really no more work than boiling an egg – albeit for an hour!