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This year is my first vegan Thanksgiving and my aunt, whose house I'm going to for the meal, is sort of put-off by it, I can tell. But, her sides are always amazing and delicious, and I am going to bring some mushroom gravy and maybe some Field Roast for my main dish. She makes an incredible apple pie - made with vegetable shortening and Earth Balance margarine - that is the best I have ever tasted, and I'm not a pie person so that's a saying something.

I'm going to have to agree with other comments that sides and pie are enough for me! 101cookbooks has a great olive oil mashed potato recipe with kale that could be vegan but still omni-friendly.

@nitsuj If I eat meat/chicken stock/etc. I get sick. I don't think it's polite of me to ruin Thanksgiving by getting violently ill just to avoid putting them out and having my host make a different recipe when they are already cooking and have invited me over to eat. Often I will bring a dish, suggest a recipe so they don't have to find one, or offer to cook. Would you think a Jewish guest should eat bacon because they are inconveniencing you by voluntarily keeping kosher?

I am a vegetarian and I was born on a Thanksgiving Day so this is a BIG DEAL for me... I just don't like to eat a bunch of side dishes that seem to have nothing in common... That's why I have taken it upon myself to make a vegetarian menu with which noboby will miss the traditional turkey. This is what I have done in the last few years:

2006
Butternut Squash Lasagna from Giada Di Laurentiis
I guess we accompanied it with a salad... can't remember

2007
Butternut Squash Mac & Cheese
Vanilla Maple Glazed Carrots
Sweet Potato Flan
Arugula/Red Onion Salad

2008
Pumpkin Rissoto
Baked Sweet Plantains
Vanilla Cheese Flan - same recipe as above, but without the sweet potato added.

2009 - this menu is still in the works... but here are a few options I am considering
pumpkin polenta
sweet potato mash with a homemade cranberry sauce
truffle mac & cheese - just because its delicious and super simple to make
roasted pears with blue cheese and hazelnut pralines

I've always gone the sides route and have been vegetarian long enough that my family respects my decision and doesn't make the sides with chicken broth or whatever. It also helps that many of our family's traditional dishes don't have animal products, like my grandmother's roasted eggplant salad.

But, if there's any worry that you're putting someone out with your request (or that you're being put out), there's no harm in bringing something to the table yourself (or asking your guest to). It lets the vegetarian be in control of their food, introduces other family members to their lifestyle choice/veggie foods and helps the host/hostess out. Honestly, most veg*ans are used to this anyway and it'll be a good experience for your brother.

Since my grandmother is getting on in years, I plan on doing a lot of cooking this year anyway. I'll be making a veggie gravy (roux of margarine/flour, veggie broth, various herbs and soy sauce for umami), green bean casserole, garlic mashed potatoes and sweet potatoes from The Modern Vegetarian Table. My husband, an omnivore, is making his signature "bird in a bag" (roasting a spice-rubbed turkey in a paper bag).

@Nickiter

Like not be a difficult eater for a day and just deal with what's given them?

Just wanted to add that vegetarian gravy is ridiculously easy to make if you have a good veggie broth or stock. Just make a roux (you can even use olive oil for a vegan gravy) and whisk in the broth, then season the crap out of it.

I'm no longer vegetarian, but when I was, I unabashedly went the parade-of-sides route. Green bean casserole was a must for me, along with stuffing (with apples!), roasted spiced sweet potatoes, homemade cranberry sauce and pumpkin pie. My vegetarian ex-husband, on the other hand, would just mix corn and stuffing into his mashed potatoes and call it a day.

My aunt is vegetarian and came to our place for dinner last year. She was the only vegetarian among us omnivores, so it was Mom to the rescue. Having grown up Seventh Day Adventist--though not vegetarian--I am accustomed to occasional vegetarian dinners. Mom made one of her delicious vegetarian loaves--which is always a hit at church pot lucks--from cottage cheese, eggs, ground nuts, bread crumbs, and perhaps mushrooms. She also made vegetarian gravy to go with, so we had to two gravies, the other being made with the drippings. I think more than half of us--owing to the general Thanksgiving pile on--had some of this veggie loaf special addition to the table and it was delicious. I think I also did a vegan stuffing with veggie stock, and all the other veggie sides were without bacon or drippings or chicken/turkey stock, which is not my preference, but everything was a hit!

I think if I were to do a veggie entree it would be three sisters stew, (corn, beans, squash) using either summer squash and corn or winter squash and hominy. The stew can be done in the crockpot and it celebrates foods of the New World and the fall harvest. The veggie loaf, the gravy, and the three sisters stew can all be made ahead and taste better the next day anyway.

I love the sides and happily eat my way through dinner with plenty of room for pie, and more pie! If you want something more specific/complete The Moosewood Restaurant Celebrates features both a fully vegetarian and a separate fully vegan Thanksgiving menu. The recipes look awesome and I plan to make a couple of them this year.

i make most of the food for my entire (HUGE) family, so i know everything that went in to the meal. and funny, even though i'm a vegetarian, i don't "resent" the choice my family has made to eat meat when i feed them- cooking is what i (most of us) do for those i care about, not a chore.

Used to have a great recipe for a nut loaf wrapped in pastry ala beef wellington. made an impressive centerpiece, but I've lost the recipe. I'm sure you could find a nut loaf online, and you could make the pastry with vegetable shortening.

Roasted vegetables with the traditional sides would keep me happy any day, and I'm not a vegetarian.

Great mushroom gravy in Sundays at Moosewood that totally faked me out the first time I made it, it tastes so meaty.

For years we had a pot-luck Thanksgiving, and along with the traditional stuff we had lots of interesting nontraditional dishes - potato salad, lasagna, phyllo-wrapped asparagus or asparagus with crumb topping. Being thankful for family and friends around the table for the day makes the food secondary. It's great to have wonderful food, and even better to share it with those we love.

Last year was my first vegan thanksgiving. I never really went for the turkey at thanksgiving when I ate meat anyway because frankly, the sides are so much better! As a vegan, you become very accustomed to NOT eating at others homes during big holidays because even if people are trying to be accomodating it is difficult to demand a vegan dish from someone (even if they are family) when they are responsible for a feast for 25 people who have different tastes. It is good to make dishes which can be veganized at the table that way people can customize based on diet.

All you vegetarians who happily gorge on sides - do you know for sure that the stuffing isn't made with chicken broth? How about everything else?