This cake is best made the day before serving, and will keep in an airtight tin in a cool place for up to 5 days. Preheat the oven to 180C/350F/Gas 4. Grease a deep 20cm/8in tin with margarine.

Mary Berry's lemon drizzle traybake cake has been a hit since the 1960s, and this is the recipe she is most asked for when stopped in the street. Equipment and preparation: for this recipe you ...