Seven Minute Cake Icing

Directions

1. 1
   Cook in double boiler.
2. 2
   Have water in bottom of boiler boiling before you put top on.
3. 3
   Mix all ingredients, except vanilla, in double boiler with mixer at high speed.
4. 4
   Continue to mix at high speed the entire cooking time.
5. 5
   Stop cooking when icing stands in a peak.
6. 6
   Then add vanilla.