Tangy slivers of preserved lemon make wonderful additions to rice and pasta dishes and salads, as well as adding zest to chicken and fish. Toss the lemon slices in kosher salt to coat, and place them into a sterile 2 quart glass jar. Pour in the lemon juice, cover tightly, and let stand on the counter for 1 week. Turn the jar over daily.
Close the lemons, and place them in a quart-size sterilized glass jar with a tight-fitting lid. Make sure the lemons are packed in tightly so that they can't move freely. Compress the lemons as you add them to the jar, squeezing them in to release more juices. Pour the salty juice you collected in the bowl over the jarred lemons.
Slice each lemon into 8 wedges, removing any seeds as you go. Reserve as much of the juice as possible. Layer the lemon wedges in a wide-mouthed 16-ounce canning jar, covering each layer with salt. Pack the jar as tightly as possible, pressing down to release the lemons' juice as you go and leaving about 1/4 inch of headspace in the jar.
Clean a 2 cup jar with hot soapy water. Slice 2 lemons into 1/8- 1/4 inch disks. (You’ll use 2 more for juicing) Salt the bottom of the jar, and begin layering the lemons, salting each slice, leaving 1 inch of room at the top of the jar. You’ll need about 2 teaspoons sea salt per 1 large (4-ounce) lemon.