A buttercream filling and chocolate glaze turn this simple sponge into something special

This simple cake requires little more than stirring, baking and eating

Credit : Haarala Hamilton

Diana Henry

The Telegraph's award-winning cookery writer

Diana Henry is the Telegraph’s much-loved cookery writer. She shares recipes each week, for everything from speedy family dinners to special menus that friends will remember for months. She is also a regular broadcaster on BBC Radio 4, and her journalism and recipe books, including Simple and How to Eat a Peach, are multi-award-winning.…