Swedish Toffee - cooking recipe

Ingredients

2 1/2 cups sugar
1 1/2 cups dark corn syrup
1/4 cup cocoa powder
1 cup heavy cream
1 cup half-and-half
6 tablespoons butter
1 1/2 teaspoons vanilla

Preparation

Combine sugar, corn syrup, cocoa, cream, half-half and 3 T butter in 3 qt heavy saucepan.
Cook over low heat, stirring until sugar dissolves.
Continue cooking, stirring no more than necessary to the hard ball stage (250*).
Watch carefully, for mixture may boil to the top of the pan.
Remove from heat; stir in remaining 3T butter and vanilla.
Pour into 9\" buttered square pan to cool.
While still warm, mark in 1\" squares; when cool, cut with a sharp knife and wrap individually in waxed paper.