Measure the orange juice and soy sauce, and set them next to the stove. Put the cornstarch in a small bowl.

In a small saucepan over medium heat, combine the orange juice and soy sauce. Stir once or twice and bring to a gentle simmer.

Add 1–2 tablespoons of cornstarch to the small bowl and whisk in about 2 tablespoons of cold water until completely smooth.

When the orange-soy mixture is simmering, slowly pour the cornstarch slurry into the saucepan while whisking constantly.

Let the sauce simmer for another 1–2 minutes, stirring, so the cornstarch cooks through and the sauce turns glossy.

Taste and adjust, adding sugar or lemon juice if needed. Remove from heat.

Spoon the sauce over your cooked chicken and garnish as preferred.