Prep your lemon: Zest the lemon first, then cut and juice it. Set both aside.
Fresh juice makes a difference here.
Load the blender: Add liquid to the blender first, followed by lemon juice, raspberries, yogurt (if using), sweetener, lemon zest, and a pinch of salt.
Blend until smooth: Start low, then increase to high for 30–45 seconds. Scrape the sides if needed and blend again until silky.
Taste and adjust: If it’s too tart, add a little more sweetener. If it’s too thick, splash in more liquid.
If you want it icier, add a few cubes and blend again.
Serve right away: Pour into a chilled glass. Garnish with a lemon wheel or a few whole raspberries if you like.