1 tsp ground allspice
2 tsp baking powder
75²µ/2Β½΄Η³ϊ icing sugar, sieved
1 tsp ground mixed spice
175g/6oz light muscovado sugar
300g/10oz self-raising flour
3 pieces stem ginger from a jar, finely chopped
3 tbsp stem ginger syrup from the jar
3 pieces stem ginger from a jar, chopped coarsely
200g/7oz black treacle
4 free-range eggs
225g/8oz margarine, softened
4 tbsp milk