1/2 cup unsweetened cocoa
1/2 cup sugar
1/3 cup light corn syrup
1/2 cup evaporated milk
1 tablespoon sour cream
4 tablespoon sweet butter
1 teaspoon vanilla extract
Combine cocoa, sugar, corn syrup, milk, and sour cream in heavy saucepan. Heat over medium flame, stirring constantly, until mixture begins to boil. Immediately turn off heat; stir in butter and vanilla. Serve warm. Makes enough for 4 good-size hot fudge sundaes.
From: "Square Meals Cookbook", Courtesy Debbie Carlson - Cooking Echo