Grandma's Fudge

Mix:
4 cups of sugar
1 large can of evaporated milk
Bring to a boil and cook for 11 minutes stirring the whole time
Take off stove
Add:
2 squares of margarine
2 pkgs  milk chocolate chips (ghiradeli or gitard chips are the best)
1 tsp vanilla
Beat with a wooden spoon till creamy.
Fold in 1 cup of chopped nuts