Valentina is good! When you use it on tuna, are you talking about canned tuna, or fresh fish? On my diet, I eat a lot of canned tuna, so I would be curious to hear how you do it, as I get tired of Mayo-Mustard-Sweet Pickle-Onion tuna salad.
Ah the beauty of tuna and Valentina!
Unless I'm specifically getting high quality tuna that can be served as sashimi, or at least seared sashimi, all of the tuna I eat is of the pouch variety:
The pouches taste much better than the cans but be sure to check the country of origin on the pouches. I was regularly getting pouches that said Ecuador which were really good. Then I started getting some that said Senegal which tasted overcooked and a lot like the cans. No sense in paying more (the pouches are $1 each) if it tastes the same.
The nice thing about tuna is changing up the recipe. Sweet relish vs dill relish, add eggs vs no eggs, etc.
My current favorite is how my wife's preparation. (She's from Mexico.) She gets mayo from the Latin section at the grocery store and it has a touch of lime in it:
Then it's a simple mix of tuna, mayo, cilantro, and onions but the real magic is the mix is spread on tostadas! Drip your desired amount of Valentina sauce and enjoy! You should have something that looks like this (ignore the Tapatio bottle, only pic I could find):
BTW, if you weren't aware, Valentina has an extra hot version: