Clean/ sterilize a pint size jar and add 1 Tbsp of salt to the bottom.
Juice two of the lemons or clementines.
Slice 3 lemons/clementines into quarters but don't slice all the way through - leave 1/2" at the bottom (see quartered picture above).
Gently open the fruit and sprinkle the inside fruit liberally with salt and push it back together. Shove one lemon in and push it down. Add 1 Tbsp of salt. Add another lemon and another Tbsp of salt. Push it down with a wooden spoon (this will smash them and that's great). Add the third lemon and another Tbsp of salt. Add lemon juice to cover the fruit.
Store in a warm dry place (unrefrigerated) and shake daily for 3-4 weeks to distribute the salt. No need to refrigerate but you should, especially once open to avoid bacteria getting into the jar. Preserved lemons and their juices are good for ~ 1 year.
Happy puckering, sour mouth 🙂 Beckie
Notes
You want the citrus to be covered by citrus juice, but in a pinch I have added a little more salt and a touch of water.
Don't be afraid to salt. Better too much than not enough. You can also rinse some of the salt off before using.