Combine the Ingredients: In a small saucepan, add the orange juice, soy sauce, honey (or brown sugar), rice vinegar, ground ginger, minced garlic, and sesame oil. Whisk everything together until well combined.

Simmer the Sauce: Place the pan over medium heat and bring the mixture to a gentle simmer. Stir occasionally to let the flavors blend and cook for about 5 minutes.

Thicken with Cornstarch: Stir in the cornstarch slurry (cornstarch mixed with a little water) to help thicken the sauce. Continue cooking for another 2–3 minutes, stirring often, until the teriyaki orange sauce becomes smooth, glossy, and thick enough to coat the back of a spoon.

Cool and Serve: Remove the pan from the heat and let the sauce cool slightly. Use it right away as a glaze for chicken, salmon, beef, or tofu, drizzle it over stir-fried vegetables, or serve it as a flavorful dipping sauce.