01 - Sprinkle the eggplant batons lightly with salt and let stand for 10 minutes to draw out excess moisture. Rinse and thoroughly 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 in batches until golden and soft, about 6 to 8 minutes. Remove and drain on paper towels.
03 - Wipe excess oil from the pan, leaving about 1 tablespoon. Add ginger, garlic, and red chili. Stir-fry for 1 minute until deeply fragrant.
04 - Add doubanjiang and cook for an additional minute, stirring constantly until the oil turns red and aromatic.
05 - Return the eggplant to the pan. Stir in soy sauce, dark soy sauce, rice vinegar, sugar, and vegetable stock. Gently combine to coat the eggplant evenly.
06 - Cover and simmer on low heat for 8 to 10 minutes, until the eggplant is exceptionally tender and flavors meld.
07 - Stir together cornstarch and water to form a slurry. Add to the pan and cook for 30 seconds or until the sauce is glossy and thickened.
08 - Drizzle in sesame oil and garnish with sliced spring onions. Serve immediately.