01 - Lightly sprinkle the eggplant batons with salt and let them rest for 10 minutes to draw out excess moisture. Rinse under cold water and pat dry thoroughly 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 brown and soft, about 6 to 8 minutes. Remove and drain on paper towels.
03 - Wipe excess oil from the pan, leaving approximately 1 tablespoon. Add ginger, garlic, and chili; stir-fry for 1 minute until fragrant.
04 - Add doubanjiang to the aromatics and continue to stir constantly for 1 minute, until the oil turns deep red and fragrant.
05 - Return eggplant to the pan. Add soy sauce, dark soy sauce, rice vinegar, sugar, and vegetable stock. Gently stir to coat the eggplant evenly.
06 - Cover and simmer over low heat for 8 to 10 minutes until the eggplant becomes very tender and flavors meld.
07 - Mix cornstarch with 2 tablespoons water to create a slurry. Pour into the pan and cook for 30 seconds, stirring, until the sauce thickens.
08 - Drizzle with sesame oil and garnish with sliced spring onions. Serve immediately.