I've been living in Boston for a couple of years, and I feel like the only good food I've eaten is at very, very expensive restaurants. Trying to find a good meal for grad students living off loans is a near impossibility. Does anyone have suggestions for good eats in Boston for about $20 or less per entree? (especially one that has options to satisfy my friends who are either vegetarian or picky (aka close-minded about trying things they haven't eaten before)). Thanks!