On hotdogs I have fried onions, Colmans English mustard and tomato sauce (not bothered about the brand of tomato sauce)
On burgers (all types, meat or no) I would have salad and mayonaise.
I think Americans would be suprised if they tried English mustard... it makes your nose run.
I like French mustard too, but I find German mustard (of the ones I have tried) has a very odd taste that I could only describe as "muddy" (and I don't mean it tastes of actual mud)








