It's not preserved; it doesn't have to be kept cool; and it is not ham or salami (or any kind of sausage). I feel like I must be missing something obvious, but I am stuck.

Not preserved: check. Doesn't have to be kept in the fridge (but likely would be in a restaurant kitchen): check. Eaten with a knife and fork: er...

Very well-known French dish :-)

[Raak] Not prosciutto, but some appreciation from the audience.
[Rosie] Not a slice of bacon. Someone in the audience has produced a foldable diagram of a pig and is attempting to make a point by pointing at it.
[Radox the Green] Yes, it does have a foreign name. Cries of "Sacre bleu !" and some laughter from the audience.
[CdM] Mycroft is consulted and states, "Between the fridge and the plate there is preparation. It's called 'cuisine' in the places I patronise, and may be classed as having been ... 'processed'."
[Chalky] Back on the right track, but not right yet. Some audience applause.
[Raak] Not lard - I think you realised that...
[Simons Mith] No. Hoots from the epicureans.