Of course, just because you're short on time doesn't mean that you just have to eat the plain tuna day in and day out. Life has so much more variety! You're already taking the time to open the tuna and drain it, so why not spend an extra 1-2 minutes and level it up!*
One way to do this (that would take extra time if you chop extra components) would be to make tuna salad. Now, tuna salad is good, but mayo, even lighter versions, isn't exactly the lowest fat food. Also, it doesn't always travel well without spoiling.
There are so many other things that you can mix in to tuna to give the flavor a different bend. Soy sauce, a little fat free salad dressing, paprika, garlic powder, ginger, etc... On this occasion I reached for:
I stuck the tuna fresh from the can into a bowl, squirted/shook in my various additions, and...
I only used about half of this mixture for my lunch, since the can I used was quite large (things from Costco come in larger sizes, you say? Nooooooo.), but the remaining half went straight into the fridge for use in a future lunch/dinner/snack.
*Why yes, I am a huge geek. Thank you for asking.