Lightly grease a 12x18 inch or larger baking sheet.
Combine water, sugar, and corn syrup in a large heavy saucepan; heat over high, stirring constantly with a heat resistant spoon, until sugar is dissolved. Stop stirring and bring to a boil. Boil until a candy thermometer reads 310 degrees F (154 degrees C) or until a small amount of syrup dropped into cold water forms hard, brittle threads. Remove from heat.
When bubbling has ceased, stir in the flavoring and a food coloring. Spread into the prepared pan so that the candy is no more than 1/4 inch thick. Cool for 45 minutes in the refrigerator. Remove from refrigerator, crack into pieces and enjoy!
Stained Glass Candy · Dinner Match Lab | Dinner Match Lab