It was the smaller of the untrimmed tenderloins I bought at the start of the pandemic. After trimming, this was the smaller end and I tied up "the chain" meat for a smaller roast not pictured. The trimmings and silverskin were used for smoke on the cook and given to the dog of our guest.

I will say that I'm kinda tired of mac and cheese via a box with the liquid cheese. I did it as the kids here eat it, but I grew up eating a "souffle style" mac and cheese and prefer it time permitting. Guess it's a "Two/ThreeAmericas" thing as my friends typically have never heard of such a dish.

Box
Bechamel version
Souffle version