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 thoroughly to combine.
03 - Sprinkle gelatin powder evenly over the fruit mixture. Let it stand for 5 minutes to bloom and absorb liquid.
04 - Add granulated sugar to the saucepan. Warm over medium-low heat, stirring constantly until gelatin and sugar completely dissolve. Do not allow the mixture to boil.
05 - Pour the hot mixture into the prepared pan. Smooth the surface with a spatula and let cool at room temperature for 30 minutes.
06 - Refrigerate the pan uncovered for 2 hours or until the candy is completely set and firm.
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 in the sour sugar mixture, pressing gently to coat all sides evenly.
09 - Store the finished chews in an airtight container, separating layers with wax paper to prevent sticking. Best consumed within one week.