I like just about everything so just about anything can be added to my burger. Couple of the less frequent but much loved toppers include guacamol, bacon, and fried onions or onion rings. I also prefer A-1 steak sauce over ketchup and mustard.
I like ketchup on my hotdogs too.I'm pretty plain kind of guy. I'm happy with ketchup and onion. I sometimes say give me the works, except no mustard, no pickle. Good meat, in my opinion, requires little else.
Next question: is it a crime to put ketchup on a hot dog verses mustard ? Some say yes. I have never acquired the taste for mustard.