1 stick butter
1/3 c. dark Karo syrup
1/3 c. undiluted canned milk
2 1/2 sq. chocolate
1 box sifted XXXX sugar
1 tsp. vanilla
Dash of salt

Put butter, chocolate, syrup and milk in saucepan and cook over low heat until chocolate is melted and mixture thickens. Cool. Sift in 1 box XXXX sugar and beat until right consistency to spread. Add vanilla and salt. This icing absolutely will not harden or crack.