I haven't tried this yet, but it looked fast and easy.
Dry cooking sherry stands in for Shaoxing rice wine in many quick preparations. Using a pale dry sherry delivers the necessary acidity without overwhelming the fermented soybean base of the hoisin. Avoid sweet cream sherries entirely. They introduce unwanted sugar that burns instantly in a hot wok.
Dropping cornstarch directly into unheated liquids prevents clumping before heat activates the starch molecules. Pulse the blades for exactly thirty seconds until the sugar crystals dissolve completely. Pour the resulting emulsion straight from the pitcher into a skillet preheated to medium-high heat. Stir constantly until the liquid thickens to a glossy coat that clings to a spoon.
Store leftover sauce in a sealed glass jar inside the refrigerator for up to five days. Cold resting deepens the fermented garlic flavor significantly. Thin the chilled mixture with one teaspoon of warm water before tossing it with cold noodles for a fast next-day lunch.