01 - Sprinkle the eggplant batons lightly with salt and set aside for 10 minutes to extract excess water. Rinse and pat dry with paper towels.
02 - Heat 3 tablespoons vegetable oil in a wok or large skillet over medium-high heat. Fry the eggplant pieces until golden and tender, about 6 to 8 minutes. Remove the eggplant and drain on paper towels.
03 - Remove excess oil from the pan, leaving about 1 tablespoon. Add ginger, garlic, and chili. Stir-fry for 1 minute until fragrant.
04 - Stir in the doubanjiang and cook for 1 additional minute, constantly stirring until the oil is red and aromatic.
05 - Return the fried eggplant to the pan. Add soy sauce, dark soy sauce, rice vinegar, sugar, and vegetable stock. Gently toss to coat the eggplant evenly.
06 - Cover and simmer over low heat for 8 to 10 minutes, until the eggplant is meltingly tender and infused with sauce.
07 - Mix cornstarch with 2 tablespoons water to create a slurry. Stir the slurry into the pan and cook for 30 seconds, allowing the sauce to thicken.
08 - Drizzle with sesame oil and garnish with spring onions before serving.