Never Fail Fudge

5 cups sugar,

1 large (12 oz.) can evaporated milk,

¼ lb. butter/margarine,

12 oz. (3/4 of 16 oz. Jar) marshmallow fluff,

1 teaspoon salt,

1 teaspoon vanilla,

1 cup walnut meats,

2 large (12 oz.) packages semi-sweet chocolate pieces.

Combine first five ingredients in 4 quart sauce pan. Stir over low heat until blended. Bring to boil over moderate heat, being careful not to mistake escaping air bubbles for boiling. Then boil slowly, stirring constantly for 5 minutes. (To soft ball stage). Remove from heat, stir in chocolate and vanilla (and nuts if used) until chocolate is melted. Pour into 2 buttered 9 X 9" inch pans and cool. Yield approximately 5 pounds.