These are Preserved Meyer's Lemons. They are From May '06 and I have used them just last week and they are fine. I do keep them in the reefer but from what i have read and given they are done in Morocco, I don't think it necessary.
I have done these in both Meyer's juice and in plain juice of what ever variety the normal year around ones are and I can't tell the difference. However, the Meyer's lemons preserved are so much better to me than the year a rounders. I have also done Persian Limes in l9ime juice and in lemon juice. To my way of thinking, don't waste your time and resources on preserved limes.
As I went to type this a couple hours ago we lost power so while I was milling about smartly awaiting its return, I ate one of the shown. Should have maybe washed some of the salt off but, now I'm thirsty.