green food colouring paste
red food colouring paste
125²µ/4Β½΄Η³ϊ plain flour
1Β½ tsp baking powder
150g/5oz caster sugar
25g/1oz cocoa powder
250g/9oz icing sugar, sifted
1 tsp vanilla extract
150g/5oz unsalted butter, softened at room temperature
125²µ/4Β½΄Η³ϊ unsalted butter, softened
1 free-range egg
8 tbsp milk
1 tbsp milk