These seem to be the most popular veggies used by Europeans for cooking in medieval times

These 4 as well. Often found in European medieval recipes

Medieval period Europeans also used barley, rye, oats, beans (usually common beans), and rice

Their butter must have tasted much better than what we have today, because their butter was made naturally, without any chemicals. Same goes for cottage cheese, butter milk, cheese, curds, and other dairy products