Something I inherited from my dad, but I do your standard dollop or two of mayo, can of chunk light in water, drained of course, and one of those little single serving boxes of raisins. Sounds weird but it's delicious. Either eat with half a sleeve of saltines or throw it on some half decent multigrain.

I dislike mayo, so I use just enough ranch for it to not be dry. Use whole chunk, celery, salt, and pep. Pickles add a nice flavor as well. If I want to go low-cal, I’ll replace the ranch with Red Hot. For bread, wheat (not toasted). Sometimes I’ll skip the bread and just nosh on the tuna salad itself.

I dont use a recipe, I just mix tuna and mayo/hummus(!) and a tiny drop of mustard until it looks sticky, not dry, but spreadable. And sometimes I add cucumber slices after spreading the spread on bread

And if I don't feel like making a mess, I eat them open-faced, so I can pile my stuff without it squeezing out of the sides

Can confirm. Been using this method for years. Might I recommend throwing lettuce, tomato and a slice of cheese between the tuna?