Arrange the frozen watermelon chunks on a baking sheet or tray to ensure they are evenly frozen and not clumped together.
Add the frozen watermelon chunks to the blender jar, making sure they are not packed too tightly so the blades can move freely.
Pour the lime juice over the watermelon chunks to help with blending and add a touch of tangy flavor.
Secure the lid on the blender and pulse a few times to break the chunks into smaller pieces, then blend on high until the mixture is smooth and frothy, about 30-45 seconds.
Check the texture; if it’s too thick to blend smoothly, add a splash of cold water and blend again until silky and uniform.
Scoop the slush into glasses, and serve immediately for the best icy, refreshing experience.