I have had two FANTASTIC vegetarian meals at Le Cellier. Yes, it is a steak house, but they are very accommodating. I wouldn't hesitate to go.
The first time, I wasn't sure about some of the sauces on the one veg entree, and the chef came out and talked to me. They were served on the side, but the sauces were still fantastic. The second time, there was a butternut squash ravioli dish, and I'm not a fan of butternut squash. So, again, the chef came out and told me what he could do instead. Again, fantastic.
As a side note, they accommodated DD, too. She didn't like anything on the kids' menu (she was 3), and they made the best grilled cheese that I've ever tasted. They just had us choose from what they had in the kitchen (English muffin and Canadian white cheddar). I was so impressed how they accommodated her, and I still dream about that sandwich.
We are going again next week! DH is not a vegetarian, and he really enjoys LC, too.
Even though it could change (and seems to seasonally), check the menu and you can get an idea.
http://allears.net/menu/menu_lcd.htm
Enjoy!