How to Make Toffee

Continue to cook the candy, stirring frequently, until it reaches 300 degrees on the candy thermometer. If the candy appears to separate (with a layer of melted butter on top) carefully stir it vigorously to make it come back together again. Watch the candy as it approaches 300, since it cooks quickly and can easily scorch at high temperatures. As it reaches the proper temperature it will turn a dark, golden amber color.