Tuna can be cooked in a lot of different ways. There is no set recipe for cooking it. A good rule of them is to look at the can; sometimes tuna cans will have a recipe on the label, or on the other side of the label, so you’ll have to take it off. You can fry tuna in a pan on the stove, but there are a lot of ways to do that too.
It all depends on what you want, and what you like. What you have on hand is also a factor in what is made with your tuna. It can be good on crackers, raw. Tuna salad is another option one could make, but there is more than one way to do so.