Walking in the door, I saw a row of racks on the wall with bags for the various types of sandwiches available. I grabbed the one that said "Vegetarian" across the top, took a marking pen out of the container on the counter, and began to fill out my order form.
The two sandwiches actually listed on the menu as vegan are the avocado and the black bean patty. I decided to keep it simple and ordered the avocado. I checked off the applicable boxes on the order form to indicate what type of sandwich, bread, vegetables, etc., I wanted, and then I took it to the cashier. I always worry that something will be included that I don't want, so I made sure to tell the cashier I was vegan. His response was to write "Vegan!!" at the top of my order form so the kitchen staff wouldn't miss it.
Which Wich is located at 1020 16th Street, and their phone number is 916-680-9424. The Which Wich website address is http://www.whichwich.com/, and the Sacramento location's Facebook page can be found at https://www.facebook.com/Which-Wich-860648264037390/. The restaurant is open Monday through Saturday from 10:00 a.m. to 9:00 p.m., and Sunday from 10:00 a.m. to 8:00 p.m.