1) In a bowl, blend the cream of tartar, egg whites and salt together at high speed until soft peaks form.
2) Slowly beat in the sugar until the mixture is glossy.
3) Then gradually beat in the vanilla and corn syrup.
4) Add the peppermint extract and blend well to mix.
5) Beat the mixture for about 6 minutes until stiff peaks are formed
6) Stir in the green food coloring, blend well.
7) Use the frosting to frost a cupcake or cake.