01 - Sprinkle the eggplant batons lightly with salt and allow them to rest for 10 minutes to draw out excess moisture. Rinse thoroughly and pat dry using paper towels.
02 - Heat 3 tablespoons of vegetable oil in a wok or large skillet over medium-high heat. Fry the eggplant pieces for 6 to 8 minutes, turning occasionally, until golden and soft. Transfer to paper towels to drain excess oil.
03 - Wipe excess oil from the pan, reserving 1 tablespoon. Add ginger, garlic, and red chili. Stir-fry for 1 minute until the mixture becomes fragrant.
04 - Add doubanjiang to the pan and cook, stirring continuously, for 1 minute until the oil turns red and aromatic.
05 - Return the fried eggplant to the pan. Pour in soy sauce, dark soy sauce, rice vinegar, sugar, and vegetable stock. Stir carefully to coat the eggplant. Cover the pan and simmer on low heat for 8 to 10 minutes, allowing the eggplant to become exceptionally tender and the flavors to develop.
06 - In a small bowl, blend cornstarch with water to form a slurry. Stir into the pan and cook for 30 seconds until the sauce thickens to a silky consistency.
07 - Drizzle sesame oil over the eggplant and garnish with finely sliced spring onions before serving.