White Mountain Frosting (adapted from Cooking Light)
4 large egg whites
1/4 tsp cream of tartar
Dash of salt
1 cup sugar
1/4 cup water
1 tsp vanilla extract
(other extracts such as lemon or coconut can also be used, decrease vanilla to 1/2 tsp and use 1/2 tsp of your desire extract)
Place egg whites, cream of tartar and salt in the bowl of a stand mixer or other large mixing bowl--taking care NOT to use plastic. Beat with a mixer until stiff peaks form. Combine sugar and water in a saucepan, bring to a boil. Cook, without stirring, until a candy thermometer registers 250 degrees. Pour hot syrup in a thin stream over egg whites, beating at high speed. Stir in extract.