The Mother in Law has been around in Chicago since at least the mid 1980’s when I first tried one. It was the guy behind the counter who told me they were called that because they give you heartburn.
lolz. I had moved away since the 90s, but never heard of a MIL. Chili + tamale = heartburn, yeah i can see that.
And oh, see my post 32 on “Tavern Style Pizza”. I am on some Chicago pizza forums and there is arguing all the time. (Of course!). Want your opinion.