Line a 15 x 10-inch baking pan with foil and butter the foil; set aside.
In a large heavy saucepan, combine water, sugar, corn syrup and food coloring.
Bring to a boil over medium heat, stirring occasionally. Cover and cook for 3 minutes
to dissolve sugar crystals. Uncover; cook on medium-high heat, without stirring,
until a candy thermometer reads 300 degrees F (hard crack stage), about 25 minutes.
Remove from heat; stir in cinnamon oil. Immediately pour into prepared pan.
Cool completely, about 45 minutes.
Break into pieces using the edge of a metal mallet.
Sprinkle both sides of candy with confectioners' sugar.