This is a variation on Claudia Roden’s recipe that has been one of our family favourites for years – another must-have at the annual family cricket match. My brother-in-law, Simon Roden, first introduced me to this cake.
225g real dark chocolate
25gunsalted butter, cut into pieces, plus more for greasing
Melt the chocolate as described. After taking the chocolate out of the oven, turn the temperature up to 180°C/Gas 4 and butter a 25cm springform tin. Mix the butter into the melted chocolate. Whisk the egg whites with the sugar to meringue/soft peak consis