Use at least a 3 1/2 quart saucepan. Butter 8 or 9-inch square pan. They have to be wrapped individually in waxed paper. 235 degrees or hard ball.

Mix in saucepan:

2 c. sugar
1 c. white Karo
1/2 c. (1/4 lb.) butter
2 sq. Baker's unsweetened chocolate

Boil with occasionally stirring until 235 degrees or hard ball. Remove from fire. Add 1 1/2 teaspoon vanilla. Pour into buttered aluminum pan immediately. Mark into square with table knife before it becomes too hard. (Repeat as it keeps flowing back together.) Wrap each in about 3 1/2 inch wax paper squares.