Charles Homans think that ketchup packets are the worst idea ever:

I think that’s wrong. Very wrong. They’re not even the worst condiment packet ever!

Ever since my decision to make common cause with our president by putting mustard on my burger, I have been fumbling ridiculously over mustard packets. Mustard gets everywhere except on my bun. Unlike mayo and ketchup, mustard doesn’t come off the fingers with a lick. It’s like toothpaste on shirts. It has staying power until you break out the soap.

That aside, the mustard experiment has gone over well. Not only does it replace mayo, but combine it with some Sriracha or Tabasco sauce and it overwhelms any cheese you might put on it and you can replace that, too.