This recipe is from Shirley McNevich's Mom's Best Recipes Vol 1. Published here with her permission.
Don't forget to check Shirley's blog.
(by Martha [Engle] Sweetser)
2 cans Eagle brand condensed milk
1 cup dark brown Domino's sugar
1 - 16oz. bottle of dark Kayro corn syrup
1 pound butter
Combine all ingredients in a saucepan over medium heat--you must stir constantly. Heat until small amount of the mixture will form a soft ball if you drop it in a glass of cold water. When done, pour on a greased cookie sheet that has a lip on all four sides. Let cool. Cut into 1" square pieces and wrap individually in small pieces of wax paper, twisting the ends closed.