Perfect Peanut Brittle

Directions

1. 1
   Boil the sugar, peanuts and Karo to hard crack stage.
2. 2
   Remove from fire.
3. 3
   Add butter; stir until melted.
4. 4
   Add soda and stir well.
5. 5
   Spread on buttered cookie sheet.
6. 6
   As it cools, pull from sides until very thin.
7. 7
   Cool and break into pieces.