I tried this recipe, increasing it by 50% since I needed more icing to decorate a fairly elaborate cake. Note I also live at altitude (recent move - not a lot of experience in adjusting recipes yet). Well, what I had after refrigerating the mixture for 2 hours was lovely caramel sauce for ice cream (after beating - unless I was supposed to be using an electric mixer to incorporate air?). So, iwth guests coming in 90 minutes I had to punt. I added 4.5 cups of confectioners sugar (so for the regular recipe that would be 3 cups), a cup at a time, beating constantly after each addition. THEN I had caramel frosting I could decorate a cake with. Everyone LOVED the frosting. I don't know if it was increasing the recipe, altitude, or what that caused my problems. I did boil it for 90 seconds instead of 60 each time, BTW.
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