The recipe may be reduced by half half to make 1 cup, if you are reducing the recipe by half use only a small amount of salt, or if you are on a sodium reduced diet you can omit the salt totally! This can also be made in the microwave.
In a small heavy-bottomed saucepan combine sugar, cocoa, cornstarch and pinch salt.
Stir in the evaporated milk and whisk constantly over LOW heat for 3 minutes or until the mixture comes to a boil; whisk simmering for another 1-2 minutes longer over low heat until thickened.