Warm the oil in a wok over medium-high heat until shimmering. Toss in the minced garlic, stirring quickly until its aroma fills the air.
Add the sweet potato leaves to the wok, stirring to coat them evenly in the oil. Pour in the soy sauce and Shaoxing wine, if using, followed by the sugar and salt. Stir to combine the seasonings thoroughly.
For a light, flavorful sauce, incorporate the water into the wok. Keep stir-frying the leaves until they soften and are well-cooked, ensuring the flavors meld beautifully. Serve immediately as a delightful side dish.