- Source: 
 - Tom King
 
 
Serves/Makes:Enough for 1 cake 
 
- Ingredients
 
  - 6 large egg yolks
 -  1 cup (225 ml) sugar
 -  1/2 cup (125 ml) water
 -  2 cups (475 ml) unsalted butter
  
  
- Preparation
 
  - Beat egg yolks with electric mixer until light in color.
 - Combine sugar and water in a small saucepan and heat, stirring constantly, until the sugar dissoves and the syrup is boiling.
 - Boil to the soft-ball stage on candy thermometer.
 -  Immediately transfer the syrup to a heatproof glass measuring  cup.
 - Using electric hand-held mixer, beat the syrup into the egg yolks in a steady stream.
 - Don't allow syrup to fall on beaters or they will spin it onto the sides of the bowl.
 - Continue beating until completely cool.
 - Gradually beat in the butter and place in airtight bowl. Bring to room temperature before using and rebeat if necessary to restore texture after it has reached room temperature.
 - You may also beat in 6 ounces of melted and cooled bittersweet chocolate when you beat in the butter to produce chocolate buttercream.
  
  
- Comments
 
 - As the name implies, BUTTER - not Crisco - must be used in order to produce BUTTERCREAM frosting!  You can not substitute margarine, or the result will be too loose.
   
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