Grate the ginger and finely mince the garlic. Fresh ingredients will give the sauce a more intense flavor.
In a medium saucepan, heat the sesame oil over medium heat. Add the ginger and garlic and sauté until fragrant, being careful not to burn them.
Add the chili flakes, soy sauce, brown sugar, rice vinegar, and water. Stir well to combine all the flavors.
In a small bowl, whisk together the cornstarch with a little water, then add it to the sauce while stirring constantly. This will thicken the sauce.
Simmer the sauce over low heat for 5-7 minutes, or until it reaches the desired consistency. Stir occasionally to prevent sticking.
Stir in the toasted sesame seeds at the end of cooking. This adds extra texture and flavor to the sauce.
Serve immediately, or transfer to a sterilized jar. It will stay fresh in the refrigerator for 5-7 days.
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