Prepare and steam the eggplants: Wash 1 medium-sized eggplant and trim the ends. Cut lengthwise into halves or quarters, then slice into long thick strips (finger-width). Steam for 8–10 minutes until translucent and soft but not mushy. Let cool for 5–10 minutes, then gently tear each piece into thin strips.
Prepare the aromatics: In a small heatproof bowl, combine 2 tbsp minced garlic, 2 tbsp chopped scallions, and 1 tbsp white sesame seeds. Set aside.
Heat the oil and pour: Heat 2 tbsp neutral oil in a small pan over medium heat for 1–2 minutes until shimmery. Carefully pour the 2 tbsp hot oil directly over the garlic, scallion, and sesame mix to let it sizzle and bloom.
Make the sauce: To the same bowl, add 1 tbsp light soy sauce, 1 tsp vinegar, 1 tsp oyster sauce, 1 tsp sesame oil, 1 tbsp water, and 1 tsp chilli oil (if using). Stir until smooth and glossy.
Combine and mix: Pour the sauce evenly over the cooled eggplant strips. Gently toss with chopsticks or tongs until coated. Garnish with extra scallions, sesame seeds, or coriander if desired.