01 - Strain the fresh watermelon juice through a fine mesh sieve to eliminate all pulp and seed particles, ensuring a completely smooth liquid base.
02 - In a medium saucepan, whisk together the granulated sugar and cornstarch until thoroughly blended and no lumps remain.
03 - Slowly pour the strained watermelon juice into the saucepan while whisking continuously to prevent any starch clumps from forming.
04 - Stir in the fresh lemon zest and vanilla extract, ensuring even distribution throughout the mixture.
05 - Place the saucepan over medium heat and stir constantly without stopping. Cook for approximately 8 to 10 minutes until the mixture transforms into a thick, glossy pudding consistency that coats the back of a spoon.
06 - Remove from heat source and gently fold in the mini dark chocolate chips, allowing them to soften and create the traditional seeded appearance.
07 - Pour the warm pudding into individual serving glasses or molds. Allow to cool completely at room temperature, then transfer to the refrigerator for a minimum of 3 hours until fully set and firm.
08 - Just before serving, generously sprinkle the surface with finely chopped pistachios, dried rose petals if using, and additional dark chocolate chips for texture and visual appeal.