Hershey's Rich Cocoa Fudge

3 cups sugar
1 1/2 cups milk
2/3 cup Hershey's cocoa
1/4 cup butter or margarine
1/8 teaspoon salt
1 teaspoon vanilla

Butter an 8 or 9-inch square pan; set aside.

In a heavy 4 quart saucepan combine sugar, cocoa, and salt. Stir in milk. Cook over medium heat; stirring constantly until a full rolling boil. Boil without stirring to 234ºF.

Remove from heat. Add butter and vanilla. Do Not Stir.

Cool at room temperature to 110ºF. Beat with wooden spoon until fudge thickens, and loses some of it's gloss. Quickly spread into prepared pan. Cool. Cut into squares. About 3 dozen.