01 - Line an 8x8-inch square baking pan with parchment paper and lightly oil the surface.
02 - Sprinkle gelatin over 1/2 cup cold water in a small bowl and allow to bloom until softened. Set aside.
03 - In a saucepan, mix orange juice, orange zest, granulated sugar, corn syrup, and 1/4 cup water. Stir over medium heat until the sugar dissolves.
04 - Raise the heat and bring to a boil. Use a candy thermometer and continue to cook until the syrup reaches 240°F (soft-ball stage), approximately 10 minutes.
05 - Remove the pan from the heat. Immediately stir in bloomed gelatin until fully dissolved and the mixture is smooth.
06 - Pour the hot mixture into the prepared pan and allow it to cool at room temperature until fully set, about 2 to 3 hours.
07 - Once set, lift the candy slab from the pan and cut into small squares or desired shapes using a sharp knife. Toss each piece in extra granulated sugar to coat.
08 - Store candies in an airtight container, separating layers with parchment paper if necessary.