Yes, you can find posts on this all over the internet, but it's new to me. I DID try some kind of preserved lemons years ago, but they were in olive oil if I remember correctly. They spoiled, and now I never even put herbs or garlic in olive oil... too risky.
I finally found Meyer Lemons in the grocery store in the next town. The price was right (and cheaper than regular lemons!) so I bought 2 bags of juicy Meyer lemons. They also had kumquats, which grew wild in the neighborhood where I visited my grandfather, and I haven't had any in years. They went in the basket, too.
I shy away from buying foods with a lot of miles to get to me, but sometimes I just can't help myself!
I mashed down the lemons a couple of times, and the next day I quartered them, added spices (cinnamon, star anise and peppercorns) and more salt. More occasional mashing, and now they are releasing more juice. Last, I added kumquats cut in half, and more salt.
After another day or two, I put them in a smaller jar (didn't do it earlier as my masher wouldn't fit in the opening of a smaller jar), put a lid on, and I'll store them in a cool place for a month before using.