The Chowhound Team split this discussion from its original location on the Los Angeles region board. If you know a source in L.A. for tuna collars, please respond here: http://chowhound.chow.com/topics/682769
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It would be highly unlikely to find a true, bone fide maguro collar unless you’ve got some serious fish market connections. The maguro collar is one of the most highly prized, selected cuts from an increasingly rare and highly valuable fish, the Bluefin tuna. Its appearance, texture and flavor, surprisingly, approximate that of wagyu beef. Demand far exceeds supply, especially among upper echelon sushi bars and restaurants, particularly in Japan.
If, indeed, you have enjoyed a meal that included genuine maguro collar, do consider it one those “meals of a lifetime”. For home preparation, fresh yellowtail collar may well have to suffice. If not, the search is on and do expect to dearly reward the purveyor if and when found.