2 1/2 cups powdered sugar
1 cup heavy cream
1/2 cup butter
6 (1-ounce) squares baking chocolate
1/8 teaspoon salt
2 teaspoons vanilla extract
In the top of a double boiler combine powdered sugar, cream, butter, baking chocolate, and salt. Cook and stir over simmering water until melted.
Cover and cook 30 minutes over low heat, stirring frequently. Stir in vanilla. Remove from heat. Serve warm.
Makes about 2 cups.