In a mixing bowl add the juice of a lime, half as much olive oil, a teaspoon of chilli and salt. Mix well and leave to one side.
Heat a griddle pan on the stove to a medium heat. Coat each tuna steak with spray oil and place on the griddle.
Turn the fish every minute or so until the tuna starts to lose the raw pink colour. Griddle until the fish is cooked all the way through. I like my tuna well done but it can be served pink in the centre.
Once you are satisfied the fish is cooked to your tastes, put on serving plates and pour the chilli and lime dressing over the fish. Serve with a rice, potatoes or bread and a large mixed salad.