There’s a story that a McDonald’s franchise owner was having trouble selling enough burgers on Fridays; and that’s how the McDonald’s Filet-O-Fish sandwich was invented.
I’ve always liked it; but it seems to me it used to be better than it is now.
I recall the original Whopper was ginormous and Burger King also had the whaler which was about as big as the ginormous Whopper only it was Cod. Arthur Treacher fish & chips? Ansolutely marvelous.