This frosting is, quite literally, the icing on the cake Try using this frosting with dairy-free cakes for birthdays, parties, or just because. It is really important to make sure that your soy margarine is cold when you start mixing and that you do not add the vinegar and vanilla until the powdered sugar and margarine are well-combined. If the soy margarine is too warm or the vinegar is added at the beginning of mixing, the margarine will "Separate, " And you'll have less a frosting and more a soupy sloppy sweet sauce. This recipe is really simple to makeyou just have to follow it