Screenshot: TikTok/@tiffanyymageeI’ve been writing about viral TikTok myths, but today we’ll dig into something a little different: a viral meal. On the surface, it’s a weird combination of flavors, but underneath is a reasonably healthy and possibly actually good-tasting meal. And then beyond that—well, that’s where it gets really weird.What is the mustard and cottage cheese plate?Basically, this is a lunch that TikToker @tiffanyymagee eats regularly, to the fascination of the Internet. She…