Caramel Sauce

Directions

1. 1
   Combine the butter, sugar, salt, and 3/4 cup of the half-and-half in a double boiler.
2. 2
   Cook, stirring constantly, until the sugar dissolves, about 10 minutes.
3. 3
   Combine the cornstarch and the remaining 1/4 cup half-and-half and stir to form a smooth paste.
4. 4
   Gradually stir the cornstarch paste into the sugar mixture and continue cooking and stirring until the sauce thickens, about 20 minutes.
5. 5
   Stir in the vanilla, then continue to cook, stirring frequently, for 30 minutes.
6. 6
   Cool for at least 30 minutes before using.