Depends quite a bit on the mustard, regular mustard is incredibly dull, but I'm kinda fond of honey mustard and strong Swedish mustard, and if I can only choose either ketchup or mustard, I tend to prefer mustard on stuff like sausages (though obviously combining the two is preferable).
I dunno, I have not listened to this weeks bombcast, but I would assume that Jeff's opinion on mustard is one of unavailability? I never really got into mustard until I went to a baseball game and my friend Emily was just putting it on everyones hotdogs while tailgating. I am one of those people who don't really complain in those situations and just eat it. It ended up being fairly good.
I personally eat mustard on most sandwhiches that call for it. Like I dunno about mustard on a tuna sub, but it goes great on a turkey sandwhich, a hot dog, ect. Plus it is generally healthier than other sauces you would put on (be it ketchup, mayonnaise or ranch sauce.
I used to put mustard and ketchup on my hot dogs, thinking that that's how it was for a reason, that mustard and ketchup were best friends and helped each other achieve maximum yum. Then I tried mustard only on a hotdog, and i discovered the lie, ketchup was holding back mustard all along. I'm strictly mustard only on my hot dogs now, but still use ketchup for like french fries and stuff.
Where did the belief that Americans don't like mayo come from? Americans eat a whole lot of mayo.
Not like other countries. Most European counties its there version of ketchup. They put it on everything. They drown they fries in it.