Why do people insist on using prepared mustard in deviled eggs? I find the vinegar twang of yellow mustard to be offensive in most things (virtually ALL things, actually)and most dissapointing in eggs! I usually use a little Coleman's DRY Mustard in the mix, along with some onion that I've grated on a Microplane, Hellman's mayo, kosher salt and fresh ground white pepper. That's the basic yolk mix, which I mash with a fork to smoothness. Garnish with whatever bits and pieces you like, or just top with good paprika, a sprinkle of dill weed, shredded basil or the like. Never a leftover yet!