Whisk ½ cup hoisin sauce, ½ cup soy sauce, 3 Tbsp. honey, and remaining 1 tsp. Chinese five-spice powder in a small saucepan to combine.
Peel and finely grate 4" piece ginger and 5 garlic cloves into saucepan. Heat over medium and bring to simmer, whisking often. Cook, stirring, until just thick enough to coat the back of a spoon, 2–3 minutes longer.