This is fun to make. For this you will need...
2 cups of brown sugar
1 stick of butter
1 1/3 cup of corn syrup
2 teaspoons of vinegar
1 teaspoon of baking soda
In a pan dissolve together brown sugar , butter , corn syrup and vinegar .
Then boil the mixture without stirring it until a drop removed from the mixture hardens when dropped in cold water.
Remove the mixture from the heat and very quickly stir in baking soda which will foam up.
Pour this into a greased cookie sheet to cool, I drew lined on mine with a knife so I knew where to break it.
Once it's cool you can break it up into chunks and enjoy.