Drain the water or oil from each can of tuna into the sink. Add tuna to a mixing bowl (Tip: I use the tupperware I know that I'll store it in!) and with a fork, start breaking down the tuna into very small pieces.
Add the mayonnaise and mix until combined. Add in carrots, celery, lemon juice, balsamic vinegar, salt and pepper and combine.
Refrigerate for at least 1 hour before serving.