And, two, a box of angel food cake mix. That’s it. You don’t have to add water or an egg or oil. Just mix, pour in the pan and, 30 minutes later, you have a baking dish filled with lemon bars.

Mary Berry decorates her version with homemade lemon curd and passion fruit seeds. Equipment and preparation: You will need a 25cm/10in angel food cake pan ... lemon curd, mix the egg yolks ...