melt butter, sugar, syurp and treacle in a pan and leave to cool slightly

sieve flour and ground ginger in a mixing bowl. add wet mix to the dry mix and beat until combined

add milk and egg and mix. if using crystallised ginger add now

leave to cool for 5 mins while you sieve the icing sugar and mix with orange juice (pure and smooth) prick the cake all over with skewer making sure not to go too deep

pour over the cake and spread evenly. leave to cool completely before slicing and serving