Slice lemons and ginger thinly and place them into your sterilized mason jar.
Add the sea salt on top and pour in filtered water until all ingredients are fully submerged.
Use a glass weight or small jar to press the ingredients down below the water line.
Cover the jar with a breathable lid (or a cloth secured with a rubber band).
Let the jar ferment at room temperature for 5–7 days. Check daily for bubbles and aroma—your nose knows when it’s ready!
Once it reaches your desired tanginess, store it in the fridge and enjoy a spoonful daily!