I've made this icing evertime I need icing for the cakes I make, I use the Macro Organic Raw Sugar and I must admit I haven't found it grainy once. Even DH loves it, even with the different taste from refined white sugar. I agree it does make a fair whack, and most times I end up putting the leftover in a container in the fridge to be used another time, I also use Homebrand stick/block butter not margarine or a butter blend. I sometimes even reduce the sugar amount as it does get rather sweet, I think most of the time I use around the 180g mark.