Slice the peaches into wedges, discarding the pits, and place them in a blender jar.
Add the ice cubes, honey (or sugar), and lemon juice into the blender with the peaches.
Secure the lid and start blending on low speed, then gradually increase to high, until the mixture is smooth and velvety, with no visible chunks.
Check the texture — it should be thick, icy, and chilled, with a vibrant peach color.
Pour the slushie into glasses, using a spoon to guide the thick mixture for a tidy presentation.
Garnish with a small slice of peach or a sprig of mint if desired, and serve immediately for the best icy experience.