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Neither--I'm a mayoanaise gal.

nothing can possibly beat mayo on 1 bun, & mustard on the other!!!
about the only food (??) still use with ketchup - fried onion rings for some odd reason????

@Baruch: Are you impugning perhaps the greatest burger side dish of all time by questioning its status as food? ;)

I like mayo on mine, too, but only if there's lettuce and tomato -- but that's a rare burger for me. I'm usually pickles, onion, mustard.

My default has always been mayo (yep, Adam, along w/lettuce and tomato) or any mayo based sauce like Shake Shack or Stone Park.

At cookouts I occasionally do the mustard & pickles only burger.

Never, ever, ketchup. Yuck!

Both! If I am in the mood for a standard burger, it would be mustard, ketchup, tomato, lettuce and cheese. But lately my favorite toppings are just shredded lettuce and thousand island dressing! YUM! Max & Erma's used to have a burger with water chestnuts and bacon...that was the ultimate!

adam, absolutely NOT - j'adore fried onion rings!! either w/ or w/o a burger. quite possibly, when done right, one of the greatest food inventions ever, & of course, does wonders for your heart.

for me, the utimate is (was) to slather "delouis" mayo on 1 side, the other w/"maille" moutarde; then sautéed onions (nice touch), tomato (hopefully in season), pickles (flat), liberally S&P; then gently place the charcoal-grilled burger w/cheddar or american cheese bet = heaven., nirvana...
lettuce adds very little, & have never understand how or why it ever became part of a hamburger serving??

adam, the side of fried onion rings is to both soak up the excess juices, etc... falling onto the plate, as well as provide the "2nd" dish. these juices are my usual substitute, under those circumstances, for ketchup.

i trust this is an appropiate defense :)))))))))

All of the above. And tabasco.

Mustard. Today, tomorrow, forever.

Mayo, tomato, lettuce, pickle and cheese.

Neither. They are both too overpowering. I liken the placement of ketchup and mustard on a burger to the use of A-1 steak sauce on a steak...its something that should only be done if the quality of the meat sucks.

My favorite burgers have blue cheese, onions, bacon, and jalapenos. Mayo can be good as well and I have a recipe for avocado mayo that makes an awesome burger topping.

You guys are missing out --- forget the ketchup and mustard and mayo! American cheese, bacon, and a nice fried egg on top of it all with some flaky sea salt. mmmmmmmmmmm....

I prefer not, hubby prefers yes. All a matter of taste. The place that started me on this kick is Rare on 37th and Lex.

Neither. I only like mayo, cheese, lettuce, and tomato on my burgers.

Ketchup, mayo, onion (fresh or grilled), leaf lettuce, tomato (homegrown), maybe guacomole or cheese (but not usually). NO pickles!

Mayo, mustard, and ketchup.

BOTH. And mayo on the buns...

These days I eat veggie burgers more than regular ones, but when I eat the regular ones it is ketchup all the way. I think I'd sooner use mayo than mustard (in addition to ketchup) because I don't eat cheeseburgers, so I'd imagine it would give it a sort of creaminess that cheese would give (though I don't really know).

Veggie burgers usually get ketchup with a bit of mustard, though this also depends on what is in the burger itself (spices, etc).

PS - I like this "question of the day" thing!

This is not an advertisement, but I like Heinz "57" sauce on my burger.

My partner & I are condiment whores....so we've tried everything imaginable....e.g. sriracha & soy sauce on turkey burgers is pretty good!

But...If you are talking about plain old backyard cookouta or picking up a sack at white castle....I gotta go with mustard over ketchup.

Fry sauce. Anything is better with fry sauce!

Mustard just doesn't sound right so it's ketchup and mayo for me.

Mustard is a Texas thing on burgers. I always also add ketchup to mine. I never had mayo on a burger til i moved to the east coast.

*shuffles uncomfortably*

Can I have salsa and avocado on a veggie patty instead, please? :(

Both, with lettuce, tomato, onions, pickles, seasonings, and sometimes other random veggies (mushrooms, peppers, whatever). Sometimes cheese, sometimes not. Ketchup and mustard can be traded for Frank's though. Or for A1. Or for teriyaki sauce. Or even for marinara and mozzerella. NO mayo.

Unless I'm trying to be a show off, and grinding my own meat, or stuffing blue cheese in the middle of the burger patty, I am completely indiscriminate about what I'll slop on a burger- ketchup, mustard (yellow, dijon or grainy), mayo, relish, pickle, bbq chips, onion rings, pickled onions sliced thin, horseradish, all and sundry hot sauces, vegetables, what else ya got? I pay zero mind to the flavor combinations in that case for some reason and I am rarely displeased.