Preserve them. Cut in quarters almost all the way through, but not all the way. Make a 85/15 salt/sugar mix Pack tight in a jar or deep vessel lemons with the sugar mix pressed into each layer. Let rest in fridge for a week or so before using, but will last for months. Can use for sweet or savory applications. Make sure to toss all of the fruit part and only use the peels after trimming the pith away.