This recipe is pretty idiot-proof because salmon heads don't overcook easily. Get your salmon head as dry as possible, and your grill as hot as possible.
Rinse fish head thoroughly and drain. Dry with paper towels. Refrigerate for a few hours – uncovered, on a rack – to let fish head dry out. Or you could use a hair dryer.
½ salmon head
Preheat grill to maximum possible. Line grill tray with aluminium foil. Place grill rack in the tray.
Sprinkle salt on cut side of fish head. Grill till slightly charred with oven door ajar, 7-8 minutes. Fish fat should start bubbling and spitting after 5 minutes.
½ tsp salt
Turn fish head over. Sprinkle skin side with remaining ¼ tsp salt. Again, grill till slightly charred, 7-8 minutes.
Serve immediately with wedge of lemon on the side.