Mustard or not mustard?

I just had a ham and cheese sandwich, and i put mustard in it. I love mustard. My favorite one is by far Maille. You can find it easily at safeway or trader's joe.

I've tried to make my own mustard a few months ago. Guess what? It didn't turn out to be good at all. The effort is not worth the result!

I just went back to my gold old Maille (which by the way is very popular in France)!