I don't know why, but I like my burgers well-done. Steaks I prefer rare, but burgers - can't handle that blood juice in the bun.
From there hmmmm:
1 - Lots of mustard and a thick slice of sweet onion.
2. - Bleu cheese dressing, bleu cheese crumbles, and onion.
3 - Bacon, mayo, mustard, onion.
4 - Mustard, sweet relish, onion.
'pends on the day and my mood.
Oh, and in most cases, venison or buffalo vs. beef.
Damn! Now I'm hungry!