This is what we serve every Christmas, everyone loves it, even the meat eaters. You can even make it the day (or two) before and throw it in a crockpot the day of and serve it from there. It goes great with mashed potatoes. You can find the Seitan (it is just wheat gluten) at Whole Foods or you can make it yourself. I've even used the vegetarian "meat" strips that Boca makes, it's all the same thing so don't freak out about it. And I usually don't use the chestnuts.
Seitan Bourguignon
1 ½ cups pearl onions
1 Tbsp minced garlic
2 tsp olive oil
½ lb portobello mushrooms, cut into 1-inch cubes
2 tsp minced fresh thyme
2 tsp minced fresh rosemary
1 tsp minced fresh sage
1 tsp dried tarragon
2 bay leaves
2 cups dry red wine
2 cups dark vegetable stock
2 Tbsp tomato paste, or ¼ cup reconstituted sun-dried tomatoes
1 Tbsp Dijon mustard
1 turnip, peeled, and cut into 1-inch cubes
2 parsnips, peeled, sliced lengthwise, and cut into ½-inch pieces
2 carrots, peeled, sliced lengthwise, and cut into ½-inch pieces
1 celery root, peeled, and cut into ½-inch dice
1 cup winter squash, peeled, seeded, and cut into 1-inch cubes
6 to 8 chestnuts, halved
8 ounces prepared seitan, cut into 1-inch cubes
1 ½ tsp ground pepper
4 tsp tamari soy sauce
2 Tbsp cornstarch or arrowroot, dissolved in ¼ cup cold water
Sea salt to taste
To make the seitan bourguignon
In a large saucepan, sauté the onions and garlic in the oil over medium heat until they lightly brown, about 5 to 7 minutes. Add the mushrooms and seasonings and sauté for 2 minutes. Add all the remaining ingredients except the cornstarch mixture and salt. Cover and simmer until the root vegetables are just tender, about 30 minutes. Stir in the cornstarch mixture and cook for about 5 minutes. Remove from heat. Adjust the salt.