This is a great quick lunch, and satisfying too. Just mix together everything but the tomato and baby spinach, season with a little salt/pepper/garlic powder/onion powder if you want to, and then put everything together in a bowl or on a plate! My avocado was really ripe, so I mashed it up and mixed it in with the tuna, but if yours is more firm, you can chop it and serve it on top with the tomato.
PPS: I just realized that I’ve been spelling avocado wrong. Crap! Forgive me? 🙂