Step 1

Whisk together cornstarch and water to form a slurry and set aside.

Step 2

Toast red pepper flakes in a medium saucepan over medium heat for about 3 minutes, to enhance flavors.

Step 3

Add vinegar, water, sugar, minced garlic, and soy sauce to the saucepan and bring to a boil. Cook for 4 minutes, stirring occasionally to prevent boiling over.

Step 4

Reduce heat to low. Slowly add cornstarch slurry to sauce, whisking until fully incorporated.

Step 5

Remove pan from heat. Sauce will thicken as it cools. Allow to cool to room temperature before storing.