Fressen is my favourite 'nice meal out' restaurant. The entire menu is vegan and they clearly mark items that are gluten-free, which saves me from hassling the wait staff and kitchen. I've been here a bunch of times, for brunch and for dinner.
The menu is set up tapas-style, so you order a few dishes to share between everyone. Things come out at all different times, it helps to pace the meal and also doesn't crowd the table too much. They serve bread (which I don't eat but smells amazing) with a fantastic hummus while you are waiting for your food to arrive. The hummus is so good I always grab a forkful.
For brunch I like the scrambled tofu. Really hearty and filling, and comes with greens and veggies on the side.
The absolute best dish on the dinner menu is the deep-fried taro balls with a mango relish-type of thing. I think they are called something more appetizing but every time I go with my boyfriend we EACH order a plate of these, plus other things to share. I only order dessert if someone else will share with me, the gluten-free chocolate amazingness is so rich and decadent I think I would buzz right out of there if I ate it all myself.
Bonus points for really cozy decor, and they have a variety of table set-ups to accommodate different size groups of people. In the summer they open the whole front wall of the restaurant so it is open to the street.