How do you all think of what to cook everyday?

Lunch here, I rarely ever cook for dinner. And I wing it. I usually have no idea what I'm going to eat for lunch in the morning. Most of the meals I make are quick and easy but that's also because I have a lot of vegetables from my parents' garden and keep the pantry full of various stuff. In this season, there's always something that needs to be processed before it goes bad, so that decides for me. Pasta with zucchini or tomato sauce or rice with fried zucchini...Or I have frozen fish, so I just throw it on a pan and boil potatoes as a side dish. The only problem for me is if I suddenly want chicken or pork and can't defrost it fast.