Simple Garlic and Black Pepper Sauce

Heat olive oil in a saucepan over medium-low heat. Add garlic, cook and stir until fragrant, 1 to 2 minutes. Add milk, salt, and pepper; stir constantly until simmering, about 2 minutes.

Whisk water and cornstarch together in a bowl until smooth. Add water-cornstarch mixture to sauce; stir continuously until sauce is thickened to desired consistency, 3 to 5 minutes.