The evolution of cuisines in recent history bares no resemblance to the evolution of cuisines in the late bronze Age to the late antiquity. For one, information was slow to travel, and influences were much further away, and besides that, most agriculture was subsistence farming: families owned land just about enough to feed themselves and sell a bit of surplus, if nothing went wrong). Recipes were passed down generations before any changes would be made by the introduction of new ingredients to the local agriculture. Most families lived on the same ingredients for their entire lives so things were a bit more stagnant than you'd imagine if you're taking recent history as your benchmark.