You'll need a clean glass jar with a tight-fitting lid (a quart-size works great).
Prep the lemons: Wash them really well and trim off just the stem ends.
Cut: Slice each lemon into thin and even slices. Remove all of the pits.
Salt generously: Coat each slice of lemon on each side with a generous amount of salt.
Place lemon slices in jar. Repeat until the jar is full.
Add juice: Press the lemons down to release some juice, then pour in enough fresh lemon juice to fully cover everything.
Seal + wait: Cover the lemons and the juice with a thin layer of olive oil. This will rise to the top and act like a seal, preventing mold.
Close the jar tightly and leave it in the fridge for 3–4 weeks.
Once the lemon rinds have softened and everything smells beautifully bright and citrusy, they’re ready to use! Pop the jar out of the fridge and just pull out a wedge whenever you want to add a burst of flavor.