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This sounds very similar to Turkish dondurma, which also contains mastic and is chewy.

The most famous region for dondurma is Kahramanmaraş, but you can get it just about anywhere. Dondurma comes in different flavors and can be dipped in the chopped nuts of your choice, as well as in hot chocolate sauce, which immediately freezes and forms a chocolate shell around the dondurma.

Every time you order dondurma, you get a show.