The name Teriyaki refers to a process of cooking meat or fish by first marinading it in a thickish savoury/sweet glaze, and then cooking it under a grill or broiler. It's very quick, easy, and delicious.
Mix all ingredients together in a small saucepan on medium-low heat. Bring to the boil, then reduce the heat and simmer until the sauce has reduced by half. You need the sauce to be cool before you use it, so make it ahead of time and cool it in the fridge, or if you forgot to do it, stick it in the freezer.
If you have any marinade left over, heat it up and pour it over the salmon. Don't use it cold - it's had raw fish in it.
Sprinkle with sliced spring onion and sesame seeds and serve with rice or noodles.
Finely sliced spring onion (green part only) and sesame seeds to garnish