Were these tender at 145? I believe Costco’s boneless “short ribs” are actually chuck roast cut into long strips, made to resemble short ribs (sort of like the beef version of pork country-style “ribs”). I wouldn’t think they’d be especially tender unless braised, although it does look as though yours were cut from a well-marbled section of the chuck. I find they vary greatly in appearance/texture/marbling from store to store and visit to visit.
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