The sauce that compliments tuna is soy sauce, ponzu, mango salsa and chimichurri.
If you want to add a spicy kick to the tuna, you an use Sriracha or spicy aioli which also compliments tuna.
Mayonnaise based sauce is a classic sauce for tuna, although you can also add lemon juice, dill or hot sauce to get a more complex flavor.
Yogurt sauce is also good for tuna and is a lighter, tangy alternative to mayonnaise, especially when you combine it with herbs.
Spicy aioli is a creamy sauce that has a garlicky kick and is perfect for adding depth to tuna.
Ponzu sauce is a Japanese citrus based sauce with soy sauce, vinegar as well as other flavors.
Chimichurri is a vibrant South American sauce that is made with olive oil, garlic and herbs.
Romesco is a Spanish sauce that is made with roasted red peppers, nuts and bread.
Lemon Juice/zest adds brightness and acidity to any tuna dish.
Dijon vinaigrette is a classic vinaigrette which complements the richness of tuna.
Mango salsa is a sweet and spicy salsa that will add a tropical twist to your tuna.
And Sriracha is a chili sauce for people who like a bit of heat.