2 1/2 c. sugar
3/4 tsp. salt
1/2 stick butter or margarine
1 5 oz. can evaporated milk (2/3 c.)
1 Jar (7 1/2oz) Marshmallow Fluff
3/4 tsp. vanilla
1 12-oz. package semi-sweet chocolate pieces
1 /2 c. chopped walnuts
Grease a 9-inch square baking pan; set aside. In large saucepan combine the first 5 ingredients. Stir over low heat until blended. Increase heat to Medium and bring to a full-rolling boil being careful not to mistake escaping air bubbles for boiling. Boil slowly, stirring constantly for 5 minutes (use Soft-Ball test). Remore from heat, stir in vanilla and chocolate until chocolate is melted. Add nuts. Turn into greased pan and cool. Makes 2 1/2 pounds.
I found this retro recipe at http://pzrservices.typepad.com/vintagerecipes.