Add zip to your tuna

Now that I have given you the background information on how I shop, let the new ingredients and recipes begin.  As I stated in the beginning, with my husband starting his own business and me being a stay at home mom, my aim this year is to spend less money on groceries but increase the taste.  Is is possible?  I think I really don't have any other choice but to push forward.  Let's learn together!
  I came across the idea of adding lemon juice and lemon zest to tuna a few years ago in a magazine.  I have since added diced red onion, diced celery, fresh ground pepper and mayo (of course).  You can also add diced pickle too.  I had a great aunt who served me a tuna sandwich once with a sliced apple on top.  I was a bit skeptical at first, but found it actually quite delicious.  If apple on tuna doesn't appeal to you, try it on the side.  Either way, you have a few new ingredients to add flavor but also to stretch that tuna a little bit further.  How did the kids like it?  5/6 isn't half bad, but then one never really liked tuna in the first place. Enjoy.