Yeah, I didn't know what they were, either. But as it says on the label, "beef boneless chuck."
These are thick chunks of beef cut to resemble "ribs" I suppose, square-cut rectangles. Super-easy to cook.
Marinated for over a day because I put the cooking of it off. Red wine, balsamic vinegar, brown sugar, salt/pep, worcestershire sauce --- that kind of thing.
Not a lot of meat here; I used one charcoal basket.
Quick 1-minute sear over the coals and then about a 30-minute cook indirect, but near the hot area.
This is about half done, after they'd been turned:
And done to medium rare:
The marinade gave the beef a nice sweet flavor. Tender and yummy.