from the Joy of Cooking
2 unbeaten egg whites
1 1/2 C granulated white sugar
5 Tbs cold water
1/4 tsp cream of tartar
1 1/2 tsp light corn syrup
Using a double boiler, place these ingredients over rapidly boiling water.
Beat with hand mixer constantly for (approx) seven minutes or until light, fluffy and spreadable.
Remove from heat. Add 1 tsp vanilla.
Makes 2 cups or enough to ice a three-layer cake.