Sterilize your glass jar by cleaning with hot water and soap. Then without drying the jar, put it in the oven at 350 degrees for 30 minutes.

Make a vertical cut half way through the lemon. The two halves should remain attached at the base.

Turn the lemon upside down and cut the lemon again half way vertically at a 90-degree angle to the first cut. You will end up with 4 pieces that are still attached in the middle.

Add 1 teaspoon of salt to each side of the lemons, then pack them tightly in the jar until no space is left. Sprinkle some salt in the jar.

Cover the jar, and keep it at room temperature in a dark closet or cabinet for a month.

The only time you are going to check on the jar is during the first 3 days to verify if the juice produced by the lemons is enough. If the lemons on top are not covered with juice, add fresh lemon juice until the top lemons are covered. Cover the jar and return it to the cabinet.