Over medium-high heat, add the oil to a pot and cook the ginger and garlic for just a minute.
Add the soy sauce, brown sugar, rice wine vinegar, sake, and sesame oil
Bring to a boil.
Mix the cornstarch and water.
When you come to a boil, add the cornstarch slurry and reduce heat to medium and simmer for 4 minutes.
Use it as a marinade, glaze, sauce, or dipping sauce.
Use for stir-fries, chicken, beef shrimp.