Peanut Butter Icing

Directions

1. 1
   Combine sugar, milk and Karo in heavy saucepan.
2. 2
   Bring to rolling boil and boil for 4 minutes.
3. 3
   Remove from heat and place in pan of cold water.
4. 4
   Add margarine, peanut butter and vanilla, beat until it thickens to spreading consistency.
5. 5
   (Don't give up, sometimes it takes a little while to thicken.)
6. 6
   If it gets too thick, add a little milk.