Fresh meat contains vitamin C, as most animals can synthesize it themselves. “Livestock” would have been the preservation method.
Fermentation can develop vitamin C, depending on what you’re fermenting. Cabbage is probably the most famous example, but pretty much everything you ferment produces at least a little.
RampantParanoia2365@lemmy.world 1 day ago
Jam, or other preserved fruits i would guess were common.
Rivalarrival@lemmy.today 1 day ago
Jams are preserved by canning, which introduces heat, which destroys vitamin C.