01 - Line an 8x8 inch baking pan with parchment paper and lightly grease it to prevent sticking.
02 - In a small saucepan, mix watermelon puree, corn syrup, and lemon juice. Stir until fully combined.
03 - Sprinkle gelatin powder evenly over the mixture. Let stand for 5 minutes to allow the gelatin to absorb liquid and soften.
04 - Add granulated sugar to the saucepan. Warm over medium-low heat, stirring constantly until both gelatin and sugar completely dissolve. Do not let the mixture boil.
05 - Pour the hot mixture into the prepared baking pan. Smooth the surface with a spatula and let cool at room temperature for 30 minutes.
06 - Refrigerate uncovered for 2 hours or until the candy is completely set and firm to the touch.
07 - In a small bowl, combine 1/3 cup granulated sugar and citric acid powder. Mix thoroughly until evenly distributed.
08 - Cut the set candy into small squares using a sharp knife. Roll each piece individually in the sour sugar mixture, ensuring even coating on all sides.
09 - Place finished chews in an airtight container, separating layers with wax paper to prevent sticking.