1. To marinade the fish combine the first 5 ingredients (not including the fish) in a mixing bowl, stir to combine and then add the fish into the marinade and allow to marinade for at least 20 minutes at room temperature.
Once marinated grill the fish over a high heat on both sides, once cooked allow to rest for a moment and prepare the remainder of the ingredients.
2. To make the mango salsa, combine the mango, chili, coriander and the lime juice and stir to
combine.
3. To assemble warm the tortillas in a pan over a medium heat until warm, alternatively this can be done in the oven by wrapping the tortillas in aluminium foil and gently heating them until soft and pliable.
4. I normally serve everything individually in separate bowls on the table to allow guests to put them together themselves however if you wish to assemble them it's a simple process of scattering the cooked fish over the warm tortillas followed by the lettuce, diced tomatoes, coriander and a dollop of the mango salsa.