Prepare an 8x8 inch pan by lining with parchment paper and lightly greasing, or grease silicone molds.

Pour cold water into a small bowl and sprinkle gelatin powder over it. Let stand for 5-10 minutes to bloom.

In a saucepan, combine orange juice, lemon juice, 2 cups sugar, and zest. Heat over medium, stirring until sugar dissolves.

Add the bloomed gelatin mass and corn syrup to the hot liquid. Whisk until fully dissolved. Do not boil vigorously.

Simmer on low for 2-3 minutes to thicken slightly. Pour mixture into prepared molds/pan.

Refrigerate for at least 4-6 hours until firm and set.

Remove from mold. If using a pan, cut into squares or shapes with a wet knife.

Toss sticky candies in the remaining 1/2 cup sugar to coat. Let dry on a wire rack for 1 hour before storing.