If you have the ambition, and your spouse will tolerate your frying food in the wee hours, this makes a super-tasting midnight snack. Yeah, it's probably not a great thing to eat late at night and then drop right back into bed, health-wise, but this is purely a guy thing. This sandwich also makes for an excellent brunch idea, being very hearty and will thus not leave you hungry. If you have a particular preference on mustard, go with your favorite. Enjoy!