These are in fact sun dried limes. In Persian the same name is used for limes and lemons (limoo). Lemon would be called "limoo zard" (yellow lime). So when they translate, they call both limes and lemons "lemon". It is known to Persians that when you say "dried lemons" in English, you really mean "sun dried limes."
(available outside of Oman in Middle Eastern
groceries)