====== Caramel Sauce ======

Can be made 1 day ahead. Cover and refrigerate. Stir over medium heat to rewarm before serving.

===== Ingredients =====
  * 1 cup sugar
  * 1/4 cup water
  * 2 tablespoons light corn syrup
  * 1/2 cups whipping cream
  * 1/4 cup (1/2 stick) unsalted butter, cut into pieces
  * 1/4 cup crème fraîche or sour cream
  * 1 teaspoon vanilla extract
  * 1/8 teaspoon salt

===== Procedure =====
  - Stir sugar, 1/4 cup water, and corn syrup in heavy medium saucepan over low heat until sugar dissolves. 
  - Increase heat and boil without stirring until syrup is deep amber color, occasionally brushing down sides of pan with wet pastry brush and swirling pan, about 8 minutes. 
  - Remove from heat. 
  - Whisk in 1/2 cup cream, butter, and then crème fraîche (mixture will bubble). 
  - Stir in vanilla and salt.