Eggplant is braised in a tangy, sweet, and spicy 'fish-fragrant' sauce that actually contains no fish. This vegetarian Sichuan family classic is boldly flavored and low in calories.
Cut the eggplant into 2-inch batons, then toss with cornstarch to coat evenly. Let sit for 10 minutes while preparing aromatics.
Mince the garlic, ginger, and slice the green onions; set aside separately for layering flavor during cooking.
Heat 2 tbsp vegetable oil in a large nonstick or cast iron skillet over medium-high heat. Fry half the eggplant pieces until golden on all sides, about 3–4 minutes per batch, turning carefully to prevent burning. Repeat with the rest, adding remaining oil as needed.
Lower the heat to medium, add garlic, ginger, and half the green onion to the pan. Stir-fry briskly for 30 seconds, then stir in doubanjiang. Fry until oil is red and fragrant, about 1 minute—careful not to burn the aromatics.
Add all eggplant back to the pan, mix well. Immediately add soy sauce, Chinkiang vinegar, sugar, and water. Stir gently and braise uncovered for 3–4 minutes until the sauce thickens and the eggplant becomes silky but holds shape.
Taste and adjust seasoning if needed. Remove from heat, scatter remaining green onion on top, and serve hot.