1/2 c. Hershey's unsweetened cocoa
1 c. sugar
1/2 c. light corn syrup (Karo)
5 oz. evaporated milk
1/3 c. butter or quality butter (such as Fleischmann's stick corn oil butter)
1 tsp. vanilla extract

Combine sugar and cocoa in medium to large saucepan. Blend in evaporated milk and Karo syrup. Cook over medium heat, STIRRING CONSTANTLY, until mixture begins to boil. Boil and stir for 1 minute.

Remove from heat and stir in butter and vanilla. Serve warm. Or -- pour into jars, allow to cool, then seal and store in refrigerator. Warm prior to serving.