Prepare the ingredients: peel and finely chop the garlic and ginger.
In a medium saucepan, combine the soy sauce, brown sugar, rice vinegar, and sesame oil. Stir until the sugar is dissolved.
Add the garlic and ginger to the saucepan. Simmer over low heat for 5-6 minutes to allow the flavors to meld.
In a small bowl, whisk together the cornstarch and water to create a smooth slurry. This will help thicken the sauce.
Pour the cornstarch slurry into the saucepan, whisking constantly to prevent lumps from forming. Cook, stirring continuously, until the sauce thickens, about 2-3 minutes.
Let the sauce cool. Serve immediately, or store in an airtight jar in the refrigerator.
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