01 -
Line a rimmed baking sheet with parchment paper and lightly oil the parchment. Measure the zest, extract, and food coloring so they are ready before the syrup reaches temperature.
02 -
Add the sugar, corn syrup, water, and cream of tartar to a heavy 3-quart saucepan. Stir over medium heat until the sugar dissolves and the mixture looks clear.
03 -
Increase the heat to medium-high and boil without stirring until the syrup reaches 300°F to 310°F, about 8-12 minutes. If sugar crystals appear on the sides, brush them down with a wet pastry brush.
04 -
Remove the pan from the heat. Carefully stir in the orange zest, orange extract, and food coloring. The mixture may bubble up, so stir slowly with a heatproof spatula.
05 -
Immediately pour the hot syrup onto the prepared baking sheet. Tilt the pan or spread with an oiled heatproof spatula to make a thin sheet.
06 -
Let the candy cool completely at room temperature, 30-45 minutes. Dust lightly with powdered sugar if desired, then break into shards and store airtight.