You don’t need a double broiler to make this and you can forget fretting over whether or not the weather is dry enough for a 7 minute frosting to “turn out”. This one comes out perfect every time just by following the instructions.
1/2teaspooncream of tartar
Combine all ingredients except vanilla in a stainless steel heavy bottomed sauce pan. Place over medium low heat and beat with an electric hand mixer constantly for 5-7 minutes, or until icing is fluffy and stiff peaks form when beaters are removed. Remove from heat and stir in vanilla. Ice cake. It takes two recipes of this to ice a layer cake.
Note: You'll need two recipes of this icing to ice a layer cake. This recipe doubles beautifully, no need to make two separate batches, just double it and make it all at once.