Begin by gathering all the ingredients needed for your Homemade Teriyaki Sauce.

In a medium-sized bowl, combine ½ cup of soy sauce, the minced garlic, grated ginger, and ¼ cup of brown sugar. Stir the mixture thoroughly.

In a separate small bowl, whisk together 1 tablespoon of cornstarch and ¼ cup of water until you achieve a smooth slurry.

Gradually pour the cornstarch slurry into the soy sauce mixture while stirring steadily.

Transfer the combined mixture to a small saucepan, setting the stove to medium heat. Stir the mixture frequently.

Allow your teriyaki sauce to cook for about 3-5 minutes, continuing to stir consistently until thickened.

Once thickened to your liking, remove the saucepan from heat. Stir in 1 teaspoon of sesame oil and optional ingredients.

Let the teriyaki sauce cool before transferring it to an airtight container.