not that it matters much or any way is 'right' but I believe aging and making high meat are entirely different things. The kind of high meat made in jars allows the bacteria to cultivate within the jar aerobically but without a constant flushing of new oxygen or for things to come and go as 'freely'.
all food breaks down by bacteria, but if you leave a cabbage on a table it will never turn into sauerkraut.
if you leave grapes out they won't turn into suitable wine and will likely just plain rot and decay.
Just as there is systems for specifically culturing 'good' bacteria found in traditional peoples these seems to be sort of half-assed and yet refined in the contemporary high meat processing, and these seem to all involve controlling the exposure to oxygen in order to get a desired results.
I haven't studied it super carefully of course, so part of the rational between burying the stuff in the ground or in shark stomachs could be to just remove pests or other animals from eating it, but I suspect not considering the lengths people go through to do certain things. But anyway its pretty common to age beef for even longer periods then typically most people make in jars and this is considered regular fare.
even though full exposure outside will likely cause meat to rot quicker than kept at a solid temp in a jar, this to my knowledge will not ever turn into a liquidy mass in nature FWIW
the main thing with aging the meat obviously is it Willl essentially dry out. often alot of the meat you buy is already aged and they just cut that dry crusty part off. Heres some interesting commentary from Slankers on ageing that is somewhat related
http://www.texasgrassfedbeef.com/faq.htmno container or exposed at all times to fresh oxygen = dry.
I don't know much about penicillin, or other typically cultured fungus or bacteria, but pretty sure these also yield better results and are arguably safer when all the variables are under control
point being if you came across a rotten carcass, the bacteria would undeniably be at the meat picking at it and changing it in some way, but it isn't exactly the same as high meat which seems to be undeniably a procedure of humans based on altering a natural process, not a natural process in itself.
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re frozen meat, the only thing we know is that frozen foods alter bacteria in some way. People read this as different extremes and some suggest its in a way that is damaging or dangerous, and others say that it is just dormant and retains more nutrition. I have no idea. but going back to the idea of variables if you are going to do something that has any implicit risk - or in the case of high meat at least takes alot of pain int he ass effort (particularly if you don't have a 1st floor kitchen) - why would you spend the 2+ months or so doing something fairly arduous which may not work out or could be harmful due to added x uncontrolled variables...