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The Majhūl date (Arabic: تمر المجهول - tamar al-majhūl, literally, unknown, from جَهِلَ, to not know) also known as Medjool, Medjoul, or Majhool, is a large, sweet cultivated variety of date (Phoenix dactylifera) from the Tafilalt region of Morocco, also grown in the United States, Israel, Iran, Saudi Arabia, South Africa, Jordan and Palestine, The variety is planted both for harvesting and for landscaping. The Medjool is a distinct landrace, described as producing "large soft fruit, with orange-yellowish flesh, and a mildly rich and pleasing flavor." Israel, with its advanced wastewater recycling technologies, currently owns more than 60 percent of the global Medjool market share, making it the largest exporter of Medjool dates in the world.
So, yeah, first off they are slightly green naturally if you use limes. You could use lemons, but mine are quite sweet, so I went with limes but there's also no reason you couldn't use a small orange instead and go for slightly orange coloured and flavoured ones. Really the flavoring is up to...