Place the frozen blueberries in your blender and add the citrus zest for a burst of fresh aroma.
Pour in the water or fruit juice, which helps the blending process and results in a smoother slushie.
Add the honey or sugar to sweeten the mixture naturally, balancing the tartness of the blueberries.
Blend everything on high speed until the mixture reaches a thick, icy, and velvety consistency, with small icy bits still visible.
Stop blending and check the texture—if it’s too thick, add a splash more water or juice and blend briefly again.
Pour the vibrant purple slushie into glasses, allowing the icy bits to settle slightly at the top for an appealing look.
Serve immediately with a straw or a spoon to enjoy the icy, crunchy texture and burst of blueberry flavor.