You will find it at hundred if restaurants and food stands all over Chicagoland and at most hot dog stands. The exact origins are a subject of debate, but it became popular in the early 1900s as more families moved out of poverty and beef roast replaced cheaper bits of ground meat. Nobody knows for sure the inventor, but the recipe was popularized by Pasquale Scala, a South Side butcher and sausage maker. During the Depression, in the late 1920s, when food was scarce, Scala's thinly sliced roast beef on a bun with gravy and fried peppers was a huge hit.
Today, beef "sangwitches" are a staple at gatherings, both family and business, all over the city. I work in the city - it's a bit of a commute for me, so I have lots of time to see all the many restaurants and little ma and pa places that advertise this specialty and it's not uncommon for a large order of from Al's showing up delivered to the security area in the front of my building for several employees who make a group order. (Why yes, I'll be carrying these sandwiches through the metal detector for you , and I just MIGHT stop at my office first).
The meat which is normally cooked with a dry rub, is cut thin and served with some hot peppers mix on fluffy Italian bread loves. You need some sturdy but fluffy white bread, because whether you call it "gravy" or "juice" you need bread that will soak it up without totally falling apart. Italian rolls are the way to go.
Give me some of that beef or I'm calling my boyz
The HOTR version of the beef sandwich starts with a jar of hot peppers known as "giardiniera". In the Chicago area, where I picked some up at a store, they're commonly made "hot" with sport peppers or "mild" without, along with a (varied) assortment of bell peppers, celery, carrots, cauliflower, serrano peppers, gherkins and sometimes crushed red pepper flakes and banana peppers, steeped in a brine, then packed in an oil blend.
To make this I also needed a can of beer (why look, I have beer! WHAT a surprise!) and a small packet of dry Italian salad dressing mix.
The meat was so tender, I cut it extra thick to give the sandwich a nice "bite". The "juice" has some heat from the peppers as well as a little sweet tang from the dressing mix and was the best part of the sandwich. It may be a break from tradition, but it was a recipe I'm going to make again and again, if Partner in Grime has his say. It made six medium sized sandwiches with a nice little slice left to cut up and put in some leftover vegetable soup.