Wash your fresh lemons thoroughly under running tap water to remove any surface dirt, wax, or debris.
This is a very Critical step to prevent dilution or spoilage.
Pat each lemon completely dry using a clean kitchen towel or paper towel. Leave them on the counter for a few minutes to ensure no moisture remains on the outer rind.
Cut the lemons cleanly into halves using a dry knife and dry cutting board.
Place a fine-mesh dry strainer over a completely dry glass bowl or stainless steel vessel. Squeeze the lemon halves using a manual citrus juicer or your hands, letting the strainer catch all the seeds and pulp chunks.
Continue squeezing all lemon halves in the same manner until all juice is collected in the bowl.
Carefully pour the strained fresh lemon juice directly into clean, dry silicone or plastic ice cube trays.
Place the tray on a level surface inside your freezer and let it sit undisturbed overnight (or for at least 8 to 10 hours) until the cubes are fully solid.
Once the lemon juice cubes are completely frozen and set, gently pop them out of the ice tray.
Immediately transfer the frozen cubes into an airtight freezer-safe container or a heavy-duty Ziploc freezer bag.
Squeeze out any excess air from the freezer bag, seal it tightly, and return it to the freezer immediately for long-term storage.
For serving, Drop 1 frozen cube into a glass of warm water and stir for 10 to 15 seconds until completely dissolved for an instant, gut-healthy morning drink.