From America's Test Kitchen Season 12: A Moroccan Feast
Makes 4 Lemons
We prefer Meyer lemons; however, if you can't find them, you can substitute regular (Eureka) lemons. Look for lemons with thin skins. Do not substitute table salt for the kosher salt. Depending on the size of your lemons, you may need more or less lemon juice to cover the lemons. You will need a 1-quart glass Mason jar for this recipe. The preserved lemons can be refrigerated for up to six months.