To a mixing bowl add the soy sauce, mirin, honey, ginger and garlic. Whisk to mix well. Add half of the marinade to a bowl add the salmon, flesh-side down, marinate for 1 hour.

Place the top shelf of oven 6 inches from the top and preheat the broiler (oven grill if you’re in the UK).

Remove the salmon from the marinade and pat dry. Discard the marinade.

Add the unused marinade to a small saucepan and whisk in the corn starch until dissolved. Bring to a simmer over medium heat until thickened, remove from the heat.

Place the salmon skin side down onto a baking sheet covered with foil. Broil for 5 minutes. Brush more marinade onto the salmon and return to the broiler for 5-6 more minutes until browned.

Finish with remaining sauce.