2/3 c. Hershey's cocoa
3 c. sugar
1/8 tsp. salt
1 1/2 c. milk
1/4 c. butter
1 tsp. vanilla

Combine cocoa, sugar and salt in a large saucepan (3 quart size). Add milk, gradually mix thoroughly, bring mixture to a "bubbly" boil. On high heat, stirring continuously. Turn control to medium heat and continue to boil this mixture, without stirring, until it reaches a temperature of 236 degrees F. (soft ball stage). Remove saucepan from heat; add butter and vanilla to mixture. DO NOT STIR. Set saucepan in cold water to hasten cooling. Beat until fudge thickens and loses some gloss. Pour into greased dish.