Never Fail Fudge

Directions

1. 1
   Mix sugar, milk, marshmallows, butter and salt in a heavy 2-quart saucepan.
2. 2
   Cook, stirring constantly over medium heat to a boil (mixture will be bubbling all over top).
3. 3
   When mixture first begins to boil set timer and continue to cook, stirring constantly for 5 more minutes.
4. 4
   Take off heat.
5. 5
   Stir in semi-sweet chocolate until completely melted.
6. 6
   Stir in nuts and vanilla.
7. 7
   Spread in a slightly buttered tray.
8. 8
   Cut into 30 pieces.