I am a most-of-the-time vegetarian, so vegetables and I are quite friendly. The only ones I don't like are olives, radishes, onions, and mushrooms. First three are flavor, and somehow fungi just isn't appealing.
Have you looked into getting Jessica (or is it Jennifer?) Seinfeld's cookbook, Deceptively Delicious (or is it Deliciously Deceptive?)? Basically it tells you how to hide veggies in otherwise veggieless foods. IE: pureed butternut squash in mac and cheese, or pureed/liquefied spinach in brownies. It's meant to fool small children, but Nick is acting like a small child with this vegetable thing.
V8, maybe? Or you could at least smack him on the head like they do in the V8 commercials!