@ibstubro and @Adagio I always wondered about that terminology too, canning. I’m guessing that way back in the olden days, before they started packing food in metal cans (like in the grocery store) they were probably “cooking” food in glass jars, and the jars were probably the first receptacles that were called cans,later to be called jars, because they were canning or cooking the food, which is the same thing, canning means cooking in this instance.
Then later, probably not until the end of the 19th century and early 20th century did factories start to “cook” food in metal cans, which would have been easier to store than glass cans. I’m guessing that the word can probably originally meant a sealed container in which food is “cooked” for preservation, but the early cans were made of glass, then when food production went into the industrialized world and metal containers were used more extensively the term “can” was used for both metal and glass containers, but the word “canning” which started out with glass “cans” ended up being used as a term for cooking food in both glass or metal cans, but most canning that you think of, being done at home, is done with glass cans.
The cans of veggies and fruits that you buy in the store today (tinned or in metal cans) is still cooked and the term canning still applies, you just don’t hear it in that regard.
In other words the word canning is more about the cooking process. The receptacle might be a metal can or a glass “can” or jar. Does that seem feasible?