For homemade teriyaki sauce - Combine soy sauce, wine vinegar, minced ginger, brown sugar, salt, granulated onion and garlic in a saucepan. While stirring, wait until the sugar granules dissolve. Mix water and starch, pour into a saucepan and stir the sauce over low heat until it thickens. Then transfer the teriyaki sauce to a bowl and let it cool.
If using bottled sauce start from here - Rinse and dry salmon pieces with skin. Divide the teriyaki sauce into two parts, leaving one part to serve the fish. With the second part, spread the salmon on top and sides.
For convenience, the basket of the air fryer can be covered with parchment paper. Lay the salmon skin side up on the parchment. Air fry at 320 F for 10 minutes.
Flip the salmon to the other side and brush with about half of the teriyaki sauce. Bake for 5 more minutes. Carefully transfer the cooked salmon to a plate. Easy to use cooking tongs.
Before serving, spread salmon pieces with more sauce, sprinkle with sesame seeds and chopped green onions.