How to Make It
Thoroughly rinse lemons; quarter lengthwise into wedges and put in a large bowl. Stir in kosher salt. With a potato masher or wooden spoon, press fruit to extract some juice. Transfer mixture to a wide-mouthed 1- to 1 1/2-quart jar. Push rosemary sprig into jar, if desired. Press fruit to immerse in juice. Seal jar and store in refrigerator at least 2 weeks or up to 6 months. In the first few days, press fruit down occasionally to submerge in liquid.
Flea St. Cafe, Menlo Park, CA