I find the taste of royal icing cloyingly sweet. I used to make my RI with meringue powder and it tasted good, but now that I cannot get that meringue powder anymore (without ridiculous shipping costs), I'm stuck making it with fresh egg whites. Here is the recipe i use:
Redpath royal icing:
1 kg bag of Redpath Icing Sugar
4 large egg whites
1 tsp (5 mL) cream of tartar
I added a tsp of lemon extract to it to give it a hint of flavor and it was alright but I'd like to find something better.