Heavily grease a cookie sheet and set aside. Combine sugar and cornstarch, put into a saucepan, and add corn syrup, glycerin, butter, water, and salt. Stir until boiling and boil until mixture reaches 255°F.

Add the flavoring and pour onto the prepared cookie sheet and allow to cool until it can be handled safely. Pull the taffy until shiny and opaque, about 10 minutes. Cut into individual pieces and allow to stand about 30 minutes, then wrap in wax paper.