Grandma's Caramels

I still haven't got these perfect.... but they still are good every year, and still get eaten! I wish Grandma was still here to help me get it right! This was what I looked forward to every year from my Grandma!

1 C. sugar
1 C. corn syrup
1/2 Cube real butter
1 pint whipping cream
1 tsp. vanilla (at the end)

Combine in a big saucepan: the sugar, corn syrup, butter and 1/3 of the whipping cream. Boil for 7 1/2 minutes; stirring constantly. Add 1/3 of the whipping cream. Boil another 7 1/2 minutes, stirring. Repeat. Add vanilla at the end. Spread in a buttered pan until cool. Cut in pieces and wrap in waxed paper.