Boiled Frosting

For an icing, here's a quick one. The ingredients are the following:

• 1 cup sugar, 1/3 cup water, 1 egg white (beaten stiff), 1/8 tsp. cream of tartar or 1/2 tbsp. lemon juice.

The Procedure:

• In a small saucepan, combine sugar, water and cream of tartar and stir until dissolved.
  
• Bring the sugar mixture to a boiling point.
• While at it, whip the egg white in a separate mixing bowl until stiff and hold a peak.
  
• Boil syrup until it spins a long thread.
• Pour gradually the hot syrup over the egg white, beating constantly.
• Add the flavoring and beat until cool and of spreading consistency.
• Spread it now on your cake.