I looked on the Net & could mostly find ads for the things to buy online. But here's one article about the founder:
Elegy for Adolph
Adolph Levis has died. His story is pure Americana, and he might literally have touched your life (or at least your lips) as he did mine. Adolph invented the "Slim Jim" -- the slick little beef-stick wrapped in cellophane and sold as a snack food, mostly in convenience stores. Years ago (before I discovered nutrition), I was hooked on Slim Jims, and lots of folks still are hooked, for $150 million worth of the things are sold each year.
Levis got the idea for his beef-stick concoction during the depression when he was peddling such edible delights as pickled pigs' feet in Pennsylvania. He hired a local meatpacker to develop his thin, dried beef stick. His logo was an elegant-looking man in a top hat whom he dubbed "Slim Jim." Slim James would've been more elegant, but that's a little prissy for bar food.
There's nothing prissy about this little item, more of a "beef-like" snack than anything that's pure cow. The mushed-up beef organs have been eliminated and some chicken stuff has been added, but it still has its original 30 magic spices and the zesty lactic acid culture that ferments for 17 hours. The whole mixture is cooked for 20 more hours, poured into molds, dried, packaged -- and shipped to a store or bar near you. Adolph's original slogan for this treat, by the way, was "Make Your Next Drink Taste Better."
I can tell you from experience that nearly anything will taste better after a Slim Jim. But still, I loved 'em, and I'm glad Adolph Levis was in my life. And for you hoity-toities who wouldn't let such low-class meat parts touch your lips: What do you think "sweet breads" are? And don't even ask how foie gras is produced.
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I would think there might be a lot of salt in these but I'm not sure as I've never had one. I know a lot of low-carbers snack on them. However, there are posts here that indicate that they are a "your mileage may vary" thing and you'll have to try them & see how you do.