6 tbsp. butter
6 c. sugar
1 tsp. vinegar
1/3 c. white Karo
1 1/2 c. milk
1/2 c. cocoa
2 tsp. vanilla
Pinch of salt

Melt butter in large pan; allow to brown slightly. Add milk, sugar, Karo, vinegar, and salt. Bring to a boil and add cocoa. Boil until it reaches soft ball stage.

Meanwhile, in a mixer bowl, have 1 to 1 1/2 cups peanut butter and vanilla. Add boiled mixture and beat. Spread in a greased 9 x 13 pan. Cool.