Combine sugar, corn syrup, and water in a saucepan
Heat over medium heat, stirring until the sugar dissolves
Stop stirring and bring the mixture to hard-crack stage, about 300°F to 310°F
Remove from heat
Stir in flavoring and food coloring, if desired
Let the syrup cool slightly until thickened
Pour into lollipop molds or onto a silicone mat in small circles
Insert lollipop sticks
Allow to harden completely
Remove from molds or mat
Wrap individually in candy wrappers or cellophane