This pineapple upside down mug cake takes just a few minutes to make Justine’s favourite device for baking (bar the oven), is the microwave – especially if it’s a combination one.
Heat the oven to 180C/160C Fan/Gas 4. Grease two 18cm/7in cake tins and line the bases with baking paper. Cream the butter and the sugar together until pale and fluffy. This will take a few ...