Preheat the oven to 180C/160C Fan/Gas 4. Using a piece of kitchen paper, grease 2 x 20cm/8in round cake tins with butter. Line the bottom of the tins with a circle of baking paper. In a large bowl ...

But, instead, someone hands you a giant knife and you realize with horror that you're expected to cut multiple perfect slices out of your elaborately decorated, awkwardly shaped round cake.