Ideally, it is best to use 50:50 caster and muscovado sugar but if I don't have any muscovado I tend to add half a teaspoon of black treacle to add flavour instead.
I love this recipe,I altered it slightly to all soft brown sugar and substituted about 80/100g off oats for a mix of linseed,chopped nuts and seeds it's so sticky even my two young boys will eat it. - 11 Jan 2016
This stuff tastes like heaven! - 02 May 2015