Remove the stems from the strawberries and freeze them if they are not already frozen to ensure a smooth texture.

If using a high-speed blender, combine all ingredients (strawberries, sugar, lemon juice or zest, and optional salt) and blend until smooth and creamy.

If using a regular blender, allow the frozen berries to thaw slightly until soft enough to blend. Process until combined, then transfer to an ice cream machine and churn according to manufacturer's instructions until firm.

Serve immediately for a softer texture or freeze for 1-2 hours for a firmer consistency. Store leftovers in an airtight container in the freezer.