Place the drained tuna flakes into a large mixing bowl.
Add in all of the other ingredients (EXCEPT THE OIL) and mix throughly.
Split into 4 equal portions and form burgers.
Put the burgers on a plate and place them in the fridge for 30 minutes to set. You can also make them the night before and leave them in the fridge for up to 24 hours.
If using an air fryer to cook the burgers, preheat the air fryer to 200°c (400F) and brush each side of the tuna burgers with the oil.
Place the burgers in the air fryer basket and cook for 6 minutes.
Turn the burgers and cook for a further 6 minutes (12 minutes in total).
If cooking in a frying pan, put 2 tablespoon of oil in a frying pan and cook the burgers for 16-18 minutes turning regularly.
If baking in the oven, drizzle the tuna burgers with olive oil and place them on a baking tray. Bake in the oven at 190°c (375F) for 25 minutes turning half way through cooking.
Serve in rolls or with salad and sweet potato fries.