Hershey's Old Fashioned Rich Cocoa Fudge

Hershey's Old Fashioned Rich Cocoa Fudge 3 cups sugar 2⁄3 cup cocoa 1⁄8 teaspoon salt 1 1⁄2 cups whole milk, no substitute 1⁄4 cup real butter, no substitute 1 teaspoon vanilla extract Line 8 or 9 inch square pan with foil; butter foil. In large heavy saucepan stir together first three ingredients; stir in milk, with a wooden spoon*. Cook over medium heat, stirring constantly, until mixture comes to a full rolling boil. Boil without stirring, to 234 degrees F on a candy thermometer (or until syrup, when dropped in very cold water forms a soft ball which flattens when removed from water). Bulb of candy thermometer should not rest on bottom of pan. (This can take 20-30 minutes). Remove from heat. Add butter & vanilla. DO NOT STIR! Cool at room temperature to 110 degrees F (lukewarm). (This can take 2 to 2-1/2 hours). Beat with wooden spoon until fudge thickens & loses some of its gloss. (This can take 15-20 minutes. It really works best if you have someone to 'tag-team' with.) It starts to look more like frosting than a thick syrup when it is ready. Quickly spread into prepared pan; cool. Cut into squares.