Butter must be used, not margarine, in making this icing. The butter is cooked and caramelised in creating the flavour base for this cake icing.
SO GREAT! My Sister in law made cookies recently frosted with a similar recipe and only stated it wa "Brown butter frosting." This was exactly it! I used it to frost butterscotch cookies---fabulous! - 04 Aug 2007 (Review from Allrecipes USA and Canada)
I was glad to find this recipe, as I had accidently burnt some butter and didn't know what to do with it. I made Blonde Brownies from this site and frosted them with this. I love the flavor of the burnt butter frosting- I've never had it before! - 05 Apr 2008 (Review from Allrecipes USA and Canada)
What more can I say than "wow". It had a very interesting flavor, for sure, and although nobody really seemed to "love" it, every drop of the icing was licked out of the bowl and eaten off of the cake! Addicting! - 08 Apr 2001 (Review from Allrecipes USA and Canada)