Never Fail Fudge

2 1/2 c. sugar
1/2 stick butter or margarine
3/4 c. evaporated milk
1 (7 1/2 oz.) jar Marshmallow Fluff
3/4 tsp. salt
3/4 tsp. vanilla
12 oz. package semisweet-chocolate pieces
1/2 c. chopped walnuts

Grease a 9-inch square baking pan; set aside. In large saucepan combine first 5 ingredients. Stir over low heat until blended. Heat to a full-rolling boil being careful not to mistake escaping air bubbles for boiling. Boil slowly, stirring constantly, 5 minutes. Remove from
heat, stir in vanilla and chocolate until chocolate is melted. Add nuts. Turn into greased pan and cool. Makes 2 1/2 pounds.