Mid-Century Fudge

Directions

1. 1
   Melt butter in heavy saucepan, add sugar, top milk, and chocolate. Stir gently until chocolate melts.
2. 2
   Boil, without stirring, until mixture forms a soft ball when a small quantity is dropped into cold water. If using a candy thermometer, cook till the chocolate reaches a temperature of 235 F-240 F.
3. 3
   Remove from heat, let cool slightly. Stir in vanilla.
4. 4
   Poor into a buttered dish. Cut into squares when nearly set.