Was here in February 2012, and here's my Lassen's review for happycow. I was very impressed to see that the deli display section of the Lassen's market has vegetarian and vegan dishes that were clearly labeled. There were various faux meat dishes in addition to other deli type dishes in the glass case display. You can also order a sandwich from the wall menu. The deli area also offers a smoothies and fresh juice bar. The prices seemed reasonable.
A good choice for a quick bite and juice when in the Thousand Oaks area.