- Cut the tuna into thin steaks and place them in a container;
- Add the chopped garlic, bay leaf, parsley, white wine, vinegar, pepper and chilli (piri-piri);
- Leave to marinate for about three hours;
- Remove the steaks, dry them on a cloth and fry them in oil;
- Add the marinade and the flour (undone in little water);
- Bring to a boil.