1 tsp. canola oil
2 cups sugar
2⁄3 cup light corn syrup
Pinch of kosher salt
1⁄2 tsp. flavored oil, such as cherry or lime
15 drops food coloring, such as red or green
30 4"-long lollipop sticks
1. Grease 2 large sheet pans with canola oil. Arrange lollipop sticks on the pans, spacing them about 3" apart; set aside.
2. Put sugar, corn syrup, salt, and 1 cup water into a medium pot; stir until well combined. Cover pot and bring sugar mixture to a boil over medium-high heat. Uncover pot and attach a candy thermometer to the inside edge. Cook, without stirring, until candy registers 310° (the hard-crack stage; see Cooking Sugar), about 15 minutes. Immediately remove pot from heat and quickly stir in flavored oil and food coloring. Working quickly, spoon about 2 tbsp. of the sugar syrup over the top of each lollipop stick to form 2"–3" circles. (If the syrup gets too stiff to spoon out, reheat over medium heat for a minute or two until it becomes easy to work with again.)
3. Set lollipops aside in a cool, dry spot to let rest until they've hardened. Serve immediately, wrap individually, or arrange in a single layer in an airtight container and store in a cool, dry spot for up to a week.