Place the cubed watermelon, sugar, and lemon juice into a blender. Blend on high until the mixture is completely smooth and no large chunks remain, about 30 seconds. The mixture should be bright red, slightly viscous, and well combined.
4 cups cubed watermelon, 0.5 cup granulated sugar, 1 tbsp lemon juice
Pour the blended watermelon mixture into a shallow dish or baking pan. Spread it evenly with a spatula to promote even freezing. Place the dish in the freezer.
4 cups cubed watermelon, 0.5 cup granulated sugar, 1 tbsp lemon juice
Every 30 minutes, remove the dish from the freezer and use a fork to scrape and stir the mixture. Continue this process for about 2 to 3 hours, until the mixture has transformed into flaky, ice-crystal structures similar to shaved ice.
Once the granita reaches the desired flaky, snow-like texture, scoop it into glasses or bowls. The crystals should be light, airy, and easily shavable with a spoon.
Serve immediately for maximum freshness and icy texture. Optionally, garnish with fresh mint leaves or a wedge of lime for added flavor.
