I put them in a wine, salt, pepper, viniger ect ect solution I made up lol. Hope it turns out! I want to do these on the smoker though. I'll give it a go. Some ppl at my wife's work requested beef. She's been taking all my cooks to work. They are loving it. So I thought if try these. My Costco does have great meat. It's a commercial kitchen equipped Costco. Lots of bone in meats.
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Looks to like they are crosscut ribs used for a Korean dish called Kahlbi.