Also known as grilled stingray fin.
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This is pretty good, with a soft firm chew that releases a beautiful smoky savoury sweet flavour.
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Pairs well with the creamy mayonnaise, which lends a milky sweet note.
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Fukusen Restaurant
More details:
https://ivanteh-runningman.blogspot.com/2022/08/fukusen-restaurant-fukusen-izakaya.html