Mix sugar, Karo syrup and water very well. Cook until candy thermometer reaches 290 degrees and spins a hard thread. Remove from heat and add red food coloring and cinnamon oil, stirring until well mixed. While candy is cooking, pour powdered sugar (about 1/4-inch thick) on 3 cookie sheets. Make rivers in powdered sugar with fingers. Pour candy into rivers, cool and break. Note: Candy placed in glass jars tied with a red ribbon, hearts or other decorations make beautiful gifts at Valentine's Day or Christmas.