Place the frozen watermelon chunks into the blender, making sure they are evenly spread out for smooth blending.
Add honey to the blender if you like extra sweetness, then secure the lid tightly.
Blend on high speed, stopping occasionally to scrape down the sides, until the mixture is smooth and creamy with a thick, slushy consistency.
Check the texture; if it’s too thick, add a splash of cold water and blend briefly to loosen it slightly.
Pour the watermelon slushie into chilled glasses, and garnish with a small wedge of watermelon or a sprig of mint for a colorful touch.
Serve immediately with a straw, enjoying the icy, fruity burst of flavor.