Gather all your ingredients measured out and ready to go.
In a medium saucepan, combine the orange juice, white sugar, brown sugar, rice vinegar, and soy sauce. Whisk until the sugars dissolve.
Add the minced fresh ginger and finely diced garlic to the saucepan and stir to combine.
Sprinkle in the red pepper flakes and adjust according to your spice preference.
Grate the zest from the orange and add it to the mixture.
Place the saucepan over medium heat and bring to a gentle boil, stirring occasionally.
In a small bowl, mix cornstarch with a splash of cold water to create a slurry. Once the sauce boils, whisk in the cornstarch mixture and cook until thickened.
Taste the sauce and adjust the seasoning if necessary.
Remove from heat and serve drizzled over your favorite dishes or as a dipping sauce.
