In a mixing bowl, combine the fresh lemon juice and lemon zest, giving it a quick stir to release the citrus aroma.
Stir in the granulated sugar until it dissolves completely, creating a bright, slightly thickened syrup.
Add cold water to the lemon mixture and stir well to combine, aiming for a syrupy consistency that’s not too watery.
If you like, lightly bruise some fresh herbs like mint or basil and stir them into the mixture for a fresh, green note.
Add a pinch of salt to enhance the lemon brightness, then stir to incorporate.
If using, mix in a splash of vodka or limoncello to help keep the sorbet scoopable and prevent large ice crystals.
Pour the mixture into a freezer-safe container, spreading it out evenly with a spatula.
Place the container in the freezer. Every 30 minutes, use a fork or spatula to scrape the mixture, breaking up ice crystals and aerating the sorbet. Repeat this process until the sorbet is firm and crystalline, about 2-3 hours.
Once the sorbet has reached a firm, scoopable texture with crackling ice crystals, it's ready to serve. Let it sit at room temperature for a few minutes to soften slightly if it’s too hard straight from the freezer.