I've never seen flavored powdered sugar before. Maybe you could grate the rind of a few limes, set it out to dry then add it to the sugar for a week or more. It should pick up the flavor but you would have bits of lime rind in there.
Personally, it wouldn't bother me to have it there, just more flavor when you take a bite. MMmmm
Try sprinkling some unsweetened Kool Aid powder in your powdered sugar. I do this with lemonade-flavored Kool Aid for rolling lemon wedding cookies in and it's scrumptious!
I also sprinkle lemonade Kool Aid in my buttercream sometimes to go on lemon cake. ![]()
Cakepro suggested Cool Aid. That's a great idea. Antonia uses it in her pech cakes too.
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