Just quickly, dudes, because I am writing this in the last 5 minutes of my lunchbreak.
You know what really rocks? Freezing single serves of things like cooked wheat grains, barley, brown rice, beans, etc etc, in little ziplock bags. You can flatten them out before freezing, so they stack together beautifully in the freezer and take up almost no space. Then, when you are desperate for lunch or dinner, they will be sitting there, waiting only to be told how best they can serve you.
Example: this morning, I realised that I had no leftovers to take in for lunch, and knew that I could not face the uni refec with any kind of equanimity. So I opened up a tupperware, and threw in the contents of a ziplock of frozen wheat grains, a couple of handfuls of frozen peas, another couple of handfuls of baby spinach, and a piece of hot-smoked salmon. The grains and peas thawed during the morning, and at lunchtime I just chucked it all in the microwave for 90 seconds to wilt the spinach, squeezed some lemon over the top, and it was delicious. Thank you, past self who cooked up too much wheat grain one night a couple of months ago and put the leftovers in the freezer. The self of today salutes you.