Caramel Piping Glaze

Have ready a 1-cup heatproof glass measure, coated lightly with nonstick cooking spray.

In a medium heavy saucepan, preferably nonstick, stir together the sugar, corn syrup, and water until all the sugar is moistened. Heat, stirring constantly, until the sugar dissolves and the syrup is bubbling. Stop stirring completely and allow the mixture to boil undisturbed until the mixture turns