Heat a drizzle of olive oil in a small saucepan over medium heat. Add the minced ginger, garlic, and orange zest and cook for 2-3 minutes, until fragrant. Stir often to avoid burning.
Stir in the orange juice, soy sauce, and sugar. Continue to cook for 3 minutes.
Stir the water and cornstarch together until fully dissolved and pour it into the sauce. Cook, stirring constantly until the sauce thickens, about 3-5 minutes.