Place a small saucepan over medium heat and add the butter. Once melted, stir in the minced garlic and sauté for 1–2 minutes until aromatic but not browned.
Pour in the honey, water, brown sugar, soy sauce, rice vinegar, and cornstarch. Whisk continuously until all components are smoothly incorporated.
Increase the heat slightly and bring the mixture to a boil, stirring often. Once boiling, reduce the heat and let the sauce simmer for approximately 5 minutes, or until it thickens to a consistency that coats the back of a spoon.
Remove from heat and allow the sauce to cool for a few minutes before serving or storing.