I was always bothered by the fact that some Pesach food (cookies and the like) looks very real, almost like the original.
Are there any authorities who have taken this as an actual issue? Isn't it possible to have an understanding of the talmudic principle taam k'ikar that it applies to that case?
I am aware that one could easily differentiate and say that taam k'ikar applies only when it actually comes from that same exact material, but still.
Are the Rishonim speaking out this distinction? Are there talmudic precedents of similar food substitutes where it is mefurash that they are not subject of taam k'ikar?