What's for lunch?

I have such a hard time with interesting, satisfying lunches during the work week. I am so tempted with larger lunches and often eat out. I think I choose decent meals, like Chick-fil-A Grilled chicken sandwich, or a Subway salad. But I think I can do better. What does everyone else eat for lunch that is satisfying? And how many calories to allow for lunch? I'm about 300 in at breakfast.