when i was a kid in pa, we had a guy who came in the bar who wored as a "cooker/janitor" at the local MEAT PACKING PLACE....tharts where they kill all the meat you eat.
hot dogs/bologna is made from the pieces of cows/pigs that cant be sold as cuts of meat. yep, basically the SCRAPS OF MEAT. most are off the floor.......
ive had the occasion to go into the packin house while this guy was workin.............the also had a 2-3 foot hole in the floor, and he would push hoofs, heads, tails(the one the dont use for soup bones you buy)and it all was ground up same thing the use to chip up tree limbs...and the suff came out below and was pressed into 24" discs after it was cooked and sold to dog food companies.
the machine that makes the PATTIE for hotdogs/bologna looks like a big cotton candy machine. in the saome room thy had the machine that makes PORK RINDS....which is not pork rinds only the fat ..and cooked really quick.
as the RESIDENT VEGITARIAN.....been a long time since i ate any of this, but MORNINGSTAR FARMS...makes a NON-MEAT CORN DOG .....wife loves em.......hope i didnt spoil you appitite))))))))))))))))))))))