If you are busy working but need a quick, filling and economical lunch then go to the sandwich house. It is located in the business area of Sorrento Valley so it is only open during the work week. The sandwiches are really good and for $3.50 a sandwich you can't beat the price. It does get crowded at lunchtime so it is best to phone in your order so that by the time you get there it should be ready and waiting for you.
I have also had catered breakfast and lunch at my office from the sandwich house and they did a really good job.