Tonno Roma

One can of Genova tuna in olive oil
Red onion
Fresh tomato
White vinegar
SaltĀ 
Seasoned saltĀ 
Pepper
Garlic salt
Basil

Put the contents of the tuna in a mixing bowl.
Add ample olive oil.
Add some white vinegar (key to having a sharp taste).
Add salt, pepper, seasoned salt, basil and garlic salt.
Slice some small pieces of red onion and then tomato. 
Add Mayo to bind the mix.

Serve on bread or cracker of your choice.