I am also a vegetarian and I love eating at Boma. Tell your server you are a vegetarian and either he/she will help you to identify the items you can eat or will arrange for one of the chefs to help you out. I'm always on the look out for protein (since too many restaurant's idea of a vegetarian dish is pasta with a few steamed veggies on top) and Boma offers things like three different varieties of hummus, falafel, various dishes containing beans and rice, and I've read about a tofu and green bean dish but haven't been there on a night when that was served. There are lots of vegetables and tasty salads and almost all of the salads were meat free.
I was told by one of the chefs that they always offer a vegetarian soup every evening. The trouble is, they usually have 3 or 4 soups at dinner and they don't indicate which one is the vegetarian one so just ask one of the folks behind the counter. I did try the Butternut Squash soup a few weeks ago without asking first if it was vegetarian (I think I decided by process of elimination that it is vegetarian, i.e., the other soups either contained meat or fish or looked like they were made with chicken or beef stock). A lot of people on these boards have raved about it but it was way too rich for me. It tasted like, and had the consistency of, unbaked pumpkin pie mixture or melted ice cream -- it would have been OK as a dessert but was much too rich for me to eat as part of the main meal. Fortunately I had taken just a small amount of it just to try it, so I didn't feel guilty that I didn't eat more than one spoonful of it!