I don't know why this place is on Happy Cow. I've went there three times for either lunch or dinner, and walked out all three times. When I told them I was vegan, they looked at me strangely and said "we can make you a salad or a veggie sandwich". Denny's can do that much and I certainly wouldn't consider them vegan, vegetarian, or even veggie friendly. Besides, a salad or veggie sandwich at Denny's would be a heck of a lot cheaper than at Monticello.
Cons: not vegan, not vegetarian, not veggie friendly