I made this icing, following the recipe exactly, but the icing turned out a liquid. After it had cooled and was still a liquid, I put it in the freezer hoping that further cooling it might work, but that still didn't work. I ended up adding a bunch of icing sugar and some more corn starch, then tried boiling it again (for longer this time). After it had cooled, it was still a liquid, and I ended up using that on my cake. It didn't taste bad, but it was messy and annoying.

I would not use this recipe again.