I have made this recipe to many times to count. It last for a long time in your refrigerator and if sugar crystals form, just microwave it. Is it wonderful over cake or ice cream or ice cream between chocolate cake with sauce on top.
Melt butter in a double boiler; drop in chocolate squares and stir until melted. Add sugar stirring well; add salt. Slowly stir in evaporated milk. Cook in double boiler with water in bottom pan until all sugar is completely dissolved stirring occasionally.