You can also substitute the mackerel with salmon fillets.

In a small bowl whisk together 45ml (3tbs) each of soy sauce, sake, and mirin. Add 15ml (1tbs) sugar and zap in the microwave for around 15 seconds to dissolve the sugar. Whisk again.

Place two mackerels* (filleted) in a shallow dish and pour over the liquid, Marinade for 30 minutes.

Remove the fillets from the dish and place in a non-stick baking dish skin side up and grill for a couple of minutes on each side (turning them over carefully).

Meanwhile, place the marinade in a small pan, add 10ml (2tsp) sugar and quickly bring to a boil. Remove from the heat and brush generously onto one side of the fillets. Return to the oven till the fish surface bubbles. Repeat on the other side of the fillets.

Place onto a serving dish and brush with a bit more marinade to glaze.