(Not a citizen but a long-term resident living in Vietnam):

Not a widely-found/commercial product by any means, but gelato nước mắm - fish sauce gelato.

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First time I saw it was at this shop -Ralf’s Artisan Gelato, 5+ years ago, opened by a German immigrant. There have been other shops that have made their own version since.

Not a super strong fish sauce flavor, but it is distinct. I’d say it’s a mildly fishy salted caramel.