Add the sliced peaches, ice cubes, grated ginger, honey, lemon juice, and water (or orange juice) into a blender.
Blend on high until the mixture is smooth, icy, and well combined, about 30-45 seconds. You should see a vibrant, frosty texture.
Stop and taste the slushie; adjust sweetness if desired by adding more honey or ginger.
If the mixture is too thick, add a splash more water or orange juice and blend briefly.
Pour the slushie into glasses, giving it a gentle swirl to distribute any settled pulp or frost.
Serve immediately with a garnish of a peach slice or a sprig of mint for a colorful finish.