Measure out the blue raspberry syrup and set it aside in a small bowl or cup.
Add the crushed ice to your blender, creating a generous layer at the bottom to help the blending process.
Pour the chilled blue raspberry syrup over the ice, allowing the vibrant color to settle evenly.
Secure the lid on the blender and start blending on low speed, gradually increasing to high until the mixture is smooth, icy, and well combined. You should hear a consistent, hummed sound as the ice gets crushed into tiny particles.
Pause the blender briefly to check the consistency; it should be thick and slushy with no large ice chunks.
Pour the slushie into glasses, revealing the bright blue color and icy texture.
Optionally, garnish with fresh fruit, a colorful straw, or a wedge of lemon for extra visual appeal.
Serve immediately, enjoying the chill and tangy flavor of this fun, icy treat.
