Vegetarians at a family Thanksgiving dinner are accustomed to getting the stink eye, the exasperated sigh and the classic "I think these mashed potatoes are meat-free... oh wait, I used chicken stock." On a day that emphasizes indulgence to the point of a bellyache, those who choose to avoid meat are often the odd ones out. Instead of complaining, vegetarians just grin, bear it and fill up on not-so-satisfying green bean casserole, dinner roles and pumpkin pie.