When I'm at home for lunch (about half the time as I work from home). I usually make something quick for lunch (10-15 minutes max). Most weekends I will make a batch of soup or refried beans and salsa for Huevos Rancheros and then quickly heat it up and add bits for lunch. I serve the soups with crackers, cheese, olives etc which I always have on hand. On the weekend, I like to make a batch of spicy puttanesca for lunch.
When I go out for lunch, I usually have either good italian sandwiches, pho, sushi, soups, stews or salads. Quiznos prime rib is a bit of a guilty pleasure.