1 1/2 c  Sugar
3/4 c  Water
3/4 ts Vinegar
3    Egg whites
15 lg Marshmallows; chopped

Combine sugar, water and vinegar in a heavy saucepan. Cook over medium
heat, stirring frequently until mixture comes to a boil and sugar disolves.
Continue cooking, stirrin frequently until mixture reaches soft ball stage
(240~). Beat egg whites until foamy. While beating at medium speed, slowly
pour hot syrup in a thin stream over egg whites. Turn mixer to high speed
and continue beating until stiff peaks form and frosting is thick enough to
spread. Fold in marshmallows. Enough to cover a 3-layer cake.