Great sage is probably the best casual vegan restaurant in the DC area. They change their menu relatively frequently, so I always find I'm trying new dishes when I visit. The ingredients are fresh, and their food is wonderfully flavorful.
I always end up getting more food than I really need because I always want a smoothie/shake, an appetizer, an entree ... and obviously dessert. They also have delicious coffee if you need a pick-me-up. This visit I ordered:
1) their pineapple/kale/ginger smoothie
2) the buffalo bites: fried cauliflower, buffalo style, with chive ranch sauce. These taste AMAZING but sometimes can get a bit soggy.
3) a "goat cheese"/avocado/pesto grilled cheese sandwich w/tomato soup. DELICIOUS but a bit messy because the cheese/avo/pesto combo tended to squirt out of the sandwich with most bites haha
4) a "sin tres leches" cake which is THE BEST dessert I've had in a while. It's less wet than non-vegan tres leches cake is, but that doesn't make it any less good. The strawberry sauce on top was a wonderful addition.
Can't wait to come back :)