01 - Line an 8x8 inch baking pan with parchment paper and lightly grease the surface.
02 - In a small saucepan, blend watermelon puree, light corn syrup, and lemon juice. Stir until thoroughly integrated.
03 - Evenly sprinkle gelatin powder over the fruit mixture and allow it to hydrate for 5 minutes.
04 - Incorporate granulated sugar and gently heat over medium-low, stirring constantly, until both sugar and gelatin have dissolved completely. Do not allow to boil.
05 - Pour the warm mixture into the prepared baking pan. Smooth the surface with a spatula and let stand at room temperature for 30 minutes.
06 - Place pan in the refrigerator uncovered for approximately 2 hours, or until candy has fully set.
07 - In a bowl, thoroughly combine granulated sugar and citric acid powder for the coating.
08 - Remove set fruit slab from pan, cut into small squares using a sharp knife, and roll each piece in the sour coating until evenly covered.
09 - Transfer finished chews to an airtight container, placing wax paper between layers to prevent sticking.