Bring slow to a boil the sugar, corn syrup, butter and 1 cup of the half & half. Then gradually stir in 1 more cup of cream. Stir frequently as mixture begins to thicken. then constantly stir as it darkens.
Cook to 254 degrees ( a little dropped into cold water forms a hard ball) I find this takes about an hour.
Pour into buttered cookie sheet with 1/2 cup broken nuts scattered over bottom.
Put in refrigerator until they begin to set and take out. When cold, cut into squares.