This is a gorgeous, sweet and spicy plum cake– great as a pudding or with afternoon tea. If you’ve never tried making a cake, this would be a great place to start. Set the oven to 180C/350F/Gas 4.

A range of possible reconciliations have been proposed, including leaky layering at 660 km, layering deeper in the mantle, or ubiquitous compositional heterogeneity like a 'plum pudding'.