Hotlips is one of few places in the Pearl District that has labeled vegan food. I had a slice of their vegan pizza, which was called "vegan foccacia" ($3) and was covered in olives, artichokes and some kind of green leafy vegetable.
The slice tasted fresh and was pretty good, though I wish the crust had been slightly thinner.
If Hotlips had mockmeat toppings and Daiya cheese or a cashew cheese, it would be even better. As it stands, it's not a bad place in the least for a quick vegan slice.