Add watermelon chunks to a blender.
Blend until smooth and juicy.
Pour the mixture into a mixing bowl.
Stir in lemon juice and sea salt.
Taste and adjust seasoning if needed.
Transfer the mixture to a shallow freezer-safe dish.
Freeze for about 3–4 hours total, scraping every 30–45 minutes after the first hour until fluffy ice crystals form.
Remove and scrape the surface with a fork.
Return to freezer for another hour.
Repeat scraping every 30-45 minutes.
Continue until fluffy ice crystals form.
Serve immediately once fully frozen and textured.