Place the pineapple, soy sauce, Mirin, ginger, garlic, sugar, vinegar and sesame oil into a blender.

Blend until well combined and smooth. Blend more for a thinner sauce or leave it a bit chunky for a thicker sauce.

Transfer to a sauce pan over medium heat. Bring to a boil then reduce heat to a simmer.

Add cornstarch to a small bowl or cup. Add in the water and stir until smooth. (I used a fork).

Whisk in the cornstarch mixture until it thickens.

Add red pepper flake, if desired, to taste.

Remove from heat and let cool slightly before using.

Toss your wings in the sauce just before serving. Reserve some sauce for dipping if desired.