This week, I reached out for something unusual and ritzy in the drive-through … a prix fixe menu at the No. 3 burger flipper, Wendy's, with 6,500 restaurants across the U.S. and 'round the world ...

And for good reason: Though the restaurant has a cramped kitchen, there are 900 items on its menu. ... But “no substitutions” rules aren’t just about kitchen efficiency these days, ...