Cut your watermelon into chunks and freeze them on a parchment-lined baking sheet for at least 2 hours, preferably overnight. You want those cubes completely solid before blending. I always freeze mine in the morning so they're ready by dinner—game changer for timing.
Add the frozen watermelon chunks to your blender with 1 cup granulated sugar, 1/4 cup fresh lemon juice, 2 cups cold filtered water, and 1/4 tsp sea salt. Blend on high speed for 2-3 minutes until the mixture reaches soft-serve consistency.
Taste your easy watermelon sorbet base and adjust sweetness now—this is the time to add more lemon juice if it needs brightness. If you want extra flavor, fold in 2 tbsp fresh mint leaves and 1 tbsp rose water by hand using a spatula.
Stir in 1/2 cup honey and 1/2 cup lime juice if you're going for the premium version. These additions make it extra creamy and tropical-tasting, but honestly they're optional. The blending process creates that silky texture on its own.
Transfer your mixture to an airtight container and freeze for at least 3-4 hours until it reaches firm scoopable consistency. Don't panic if it looks a little soft after blending—it thickens up dramatically in the freezer.
Remove from the freezer 5 minutes before serving so you can actually scoop it without breaking your wrist. Mine always gets rock-hard, which means it's being stored perfectly, but you'll need that short thaw time.
Serve in chilled bowls with extra mint leaves or a drizzle of lime juice on top. Store leftovers covered in the freezer for up to three weeks, though it never lasts that long at my house.