Never Fail Fudge

Directions

1. 1
   Put sugar, cream, butter and salt in a heavy saucepan.
2. 2
   Cook over medium heat, stirring constantly and bring to a rolling boil. Boil for 5 minutes.
3. 3
   Remove from heat and add last 3 ingredients.
4. 4
   Stir until marshmallows are melted.
5. 5
   Pour into buttered 8-inch square pan.
6. 6
   Chill.
7. 7
   Add 1/2 cup chopped nuts, if desired.