450g/15oz caster sugar
300²µ/10Β½΄Η³ϊ icing sugar
50²µ/1ΒΎ΄Η³ϊ icing sugar
450g/15oz self-raising flour
450g/15oz unsalted butter, softened plus extra for greasing
8 free-range eggs
4-5 tbsp strong espresso coffee
3 tbsp strong black coffee