Place the frozen peaches into the blender.
Add the freshly grated ginger on top of the peaches.
Pour in the honey or agave syrup if you prefer a sweeter slushie, then add the cold water to assist blending.
Secure the lid on the blender and blend on high until the mixture is smooth and icy, about 30-45 seconds. You should see a vibrant pink color and a thick, slushy texture.
Taste the slushie and adjust sweetness if needed by adding more honey or agave, then blend briefly again to incorporate.
Pour the chilled peach ginger slushie into glasses, ensuring equal portions for a refreshing presentation.
Enjoy immediately with a straw or a garnish of fresh peach slices or a sprig of mint for extra appeal.