Azteca is suprisingly a great place to take a huge group for lunch. They're speedy, you can call ahead and reserve a giant table, and they don't complain too much about haveing 20 seperate checks.
I normally order something small off the lunch menu, because I inevitably fill myself up with chips and salsa before my lunch even comes. I always save room for the desert at the end!
Pro tip: if you're trying to get out of Azteca to head towards Billy Graham, go out the back of the parking lot to come out at the light. Making a left onto Woodlawn is just plain crazy.