FWIW, my experiences are:
Growing up in a suburban, more or less Jewish household, but with many family members who ate out in the city regularly. We ate a lot of meat because Granddad worked in the Stockyards and as a very taciturn fellow liked to express himself and his love quietly by doing - in this particular instance by delivering massive quantities of meat at no charge most weeks.
Anyway, the only steak I remember eating at home was skirt steak. Mom marinated it in some ketchup-based sauce, probably not unlike the barbecue sauce approach, and then broiled it. Need to see if I can get that recipe as it was quite good. In the strange outcome category, my brother who is a pretty adventurous and cosmopolitan diner in most ways still prefers all steaks with ketchup. Putting it all together I now understand the source of that quirk, even if it is sacrilege to me.
While we did go out to eat a fair amount, including to some of the old, Jewish delis mentioned in this thread, we never had skirt steak at them so I can add nothing there. From visits in Central Europe, I conclude that the lowest class in the eyes of everyone else in that part of the world are the Gypsies who come from "Romany," so I think a more likely derivation/explanation of Roumanian is as a reference to a Gypsy-style preparation than anything to do with Romania, Romanian Jews or the like. If they were concealing anything, it might have been a Gypsy association.
As to cookbooks, I have a much-enjoyed copy of Joan Nathan's Jewish Holiday Kitchen for this type of cooking, i.e. Jewish diaspora cuisine. I particularly appreciate how she covers all the different European and African styles both in the recipes and narrative.
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Feeling (south) loopy