Chocolate Fudge
["2/3 c. cocoa", "3 c. sugar", "1/8 tsp. salt", "1 1/2 c. evaporated milk", "1/4 lb. butter", "1 tsp. vanilla"]
["Combine cocoa, sugar and salt.", "Gradually add milk.", "Cook to a soft ball stage (small amount of mixture dropped in a cup of cold water will form a soft ball).", "Add butter and vanilla.", "Let cool, then beat on a marble slab."]
["cocoa", "sugar", "salt", "milk", "butter", "vanilla"]