There are still some fairly old recipes floating around if you are really looking, at least here in my area...but I think, the everyday-food has been pretty simple and quite boring, such as oatmeal, oatcakes, stew...
That's been my general impression. I'm something of a historical-food geek. Some "olden days" dishes were quite elaborate and strongly flavored (even *weirdly* flavored for our modern palates, e.g. the medieval European habit of putting sugar in all sorts of meat and vegetable dishes, or Romans adding herbs, spices, and
garum (fish sauce) almost randomly to everything).
But other things were either so labor-intensive or dull by comparison that when newer ingredients and dishes came on the scene (and technology allowed more fresh produce, dairy, and meat), things such as corned beef or stockfish dropped in popularity.
If you want to follow up, let's pursue this discussion over in the
Recipe (etc.) thread. I'm happy to share recipes or take questions.