01 - Sprinkle the eggplant batons generously with salt and let stand for 10 minutes to draw out excess moisture. Rinse under running water 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, turning occasionally, until golden and tender, approximately 6 to 8 minutes. Remove from the pan and drain on paper towels.
03 - Pour off excess oil, leaving about 1 tablespoon in the pan. Add ginger, garlic, and red chili. Stir-fry for 1 minute until fragrant.
04 - Add the doubanjiang and cook for 1 minute, stirring constantly, until the oil becomes red and aromatic.
05 - Return the fried eggplants to the pan. Add soy sauce, dark soy sauce, rice vinegar, granulated sugar, and vegetable stock. Stir gently to coat the eggplants evenly.
06 - Cover the pan and simmer on low heat for 8 to 10 minutes, allowing eggplants to soften and flavors to meld.
07 - In a small bowl, stir together cornstarch and water to create a slurry. Pour the slurry into the pan and cook, stirring, for about 30 seconds until the sauce thickens.
08 - Drizzle with toasted sesame oil and garnish with fresh spring onions before serving.