Slice the top and bottom of the limes and make an X shaped cut into them- about ¾th of the way in.
Stuff them with sea salt.
Add limes to a glass jar and add the bay leaves and black peppercorns.
Make sure you pack the limes until the jar is full, and keep pressing down as you add the limes in. Doing this will cause the limes to release their juices. You’ll need enough juice to let the limes stay submerged.
Notes
Make sure the limes are completely submerged at all times. You want to add some extra lime juice to do this.
Remember to sterilize the jar before you use them to add the limes in.
Use a wide-mouth jar to store the limes. This will make it easier for you to remove and pack in the limes.
Make sure you wear gloves while packing the limes in. The idea is to keep the entire thing clean and free of any possible bacteria.