It's a little out of the way (depending on where you're staying), but the food is great. You can take the red line to Porter and then walk up Somerville. It was about a 30 minute walk.
Dosa Temple is an all vegetarian restaurant, they have vegan items labeled on the menu. They have an Indo-Chinese section on the menu, I had a small bowl of the hot & sour soup to start. It was labeled as being spicy, and they definitely mean it! I find a lot of Indian restaurants label things that are pretty mild as spicy but I barely made it through the small bowl. It did taste good though!
After that I had the Aloo Gobi which was delicious and much easier to eat :). I got it with rice but ended up getting some Chapati bread as well which was great for soaking up the sauce.Pros: delicious food, friendly