It must be my one you saw there.
500 gram butter
1000 gram confectioners sugar
2 - 3 teaspoons of vanilla sugar
2 drops of tropical essense (or any essense you like)
2 eating spoons of milk (if the mix is a bit hard)
Beat it for about 5 minutes or more.
I hope you understand it, my english is not perfect and I do not know all the right words.
I just picked some passion fruit flavoring up at our local chef supply store. It was in the candy section and I didn't know if it would work for icing, but I bought it anyway, because it sounded so good. Thanks for the good advice, I will definetly give this a try on my next cake. SARAH