Add all of the ingredients to a small pot, except for the cornstarch.
Heat to medium heat and warm through, stirring, until the ingredients combine.
In a small bowl, whisk the cornstarch with 2 tablespoons of cold water, until the cornstarch dissolves.
Pour the cornstarch and water mixture into the hoisin sauce pot and whisk until well combined.
Heat for another 1-2 minutes, until the hoisin sauce thickens.
