2. Cleanliness! Make sure you put in serious effort to ensuring the things you're delivering were prepared properly and cleanly. That they arrive nicely (tape soup lids well!). One round of office food poisoning...
3. Target individuals and teams. Get groups of people in companies to start "Lunch Pooling" (thelunchpool.com available :D). Make a minimum subscriber count of 3 or even more, so it's worth your while and people are forced to spread the word. Or even use the PayPal/Dropbox technique, people inviting others could get a free lunch. If enough employees do it on their own some companies will decide to just do it for the whole company. The Apple approach to "enterprise" sales.
4. Come to Santa Monica, CA.