Seafoam Icing

Directions

1. 1
   Combine all ingredients, except for the vanilla in the top of a double boiler.
2. 2
   Cook over rapidly boiling water, using an electric beater, beat until the mixture stands in soft peaks.
3. 3
   Remove from heat.
4. 4
   Add the vanilla and continue beating until icing is thick enough to spread.
5. 5
   This makes enough for a large cake.