01 - Lightly sprinkle the eggplant batons with salt and let them stand for 10 minutes to release excess moisture. Rinse thoroughly and pat dry with paper towels.
02 - Heat 3 tablespoons vegetable oil in a wok or large skillet over medium-high flame. Fry the eggplant pieces in batches until golden and softened, approximately 6 to 8 minutes. Remove and drain on paper towels.
03 - Wipe out any excess oil from the pan, leaving about 1 tablespoon. Add the chopped ginger, minced garlic, and sliced chili. Stir-fry for 1 minute until the mixture is aromatic.
04 - Add the doubanjiang to the aromatics and cook, stirring continuously, for 1 minute until the oil turns red and fragrant.
05 - Return the fried eggplant to the pan. Incorporate soy sauce, dark soy sauce, rice vinegar, sugar, and vegetable stock. Stir gently to coat the eggplant evenly.
06 - Cover and simmer over low heat for 8 to 10 minutes, allowing the eggplant to become very tender and the flavors to meld.
07 - Stir together cornstarch and water to create a smooth slurry. Add to the pan, stirring until the sauce thickens, about 30 seconds.
08 - Drizzle the finished dish with toasted sesame oil and garnish with spring onions before serving.