Butter an 8" square pan

Put chocolate and milk in a heavy saucepan; heat and stir over low heat until mixture is smooth and well-blended.

Add sugar and salt and stir over medium heat until sugar is dissolved and mixture starts to boil.

Continut boiling over medium heat, without stirring to the "soft ball" stage (234F on a candy thermometer).

Remove from heat and add butter and vanilla.

Let cool to lukewarm (110F) then beat the mixture until it loses its gloss and holds it's shape. Pour into pan and cool until set, then cut into squares.

Enjoy!