Here's the link to the St. Louis Magazine piece.
This photo is of the Minneapolis location, via the Minneapolis Star-Tribune's website, but it sure looks like what I recall ours did. The only thing I'd note is that I originally mean to write about the Friday after Thanksgiving, which was a far bigger mob scene than December 26 must have been back then, say, in the Eisenhower Administration.

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I don’t recall The Forum cafeteria. When I was growing up in the ’60s, I fondly recall meeting my dad at his office on Friday evenings and going to Miss Hullings. Walking down to enter under street level. I loved their prime rib, I remember my dad ordering fried scallops.
Other old favorites now gone:
The Famous-Barr in Clayton (more than downtown) and ordering their french onion soup. Hot, cheesy, rich — a meal in a crock.
The Howard Johnson on the west side of Lindbergh near Ladue — the all-you-can-eat fried chicken was on Mondays, I think, and they did an AYCE fried clams on Thurs. Back in those pre- and teen years, all-I-could-eat was a LOT.
Nino’s, a little Italian place in a strip mall on the south side of Olive close to but before the Inner Belt. They did St. Louis-style pizza and t-ravs, an had a combo where you could get both.
And The Fatted Calf is still too fresh a wound…
Yes, it was more or less directly across from Famous-Barr. I don’t remember the chandeliers, but the guy with the mop was omnipresent — my mother refused to go there anymore because of the guy slopping the floors while we were eating.
We would eat there 3 – 4 times a week plus the weekend. There was so much of a variety for everyone. With 4 in the family, all of us would have something different. I loved the veal, all the vege and salads. There were staples we got everyday. We always got dessert. Sunday for breakfast was the greatest. They had a coffee cake that mother just love. One of my fondest childhood memories.