I remember when the fast food roast beef sandwich restaurants started in the late 60s. Even at Arby's, you'd see a REAL hunk of roast beef heating in a disply case.....none of that coagulated meat soup crap they sell today!
I was at arby’s last week they had the big roast and it looked hot. They then sliced my sammy roast beef on the slicer. Could see them doing it right after I ordered. I noticed it right away. Hadn’t been in years but it was damn good with their horsey sauce.