In a wide pan over medium heat, heat about 2 tablespoons of oil.
Add eggplant in a single layer and cook, turning as needed, until lightly browned. With a slotted spoon, remove from the pan and drain on paper towels.
In a bowl, combine chili garlic sauce, soy sauce, balsamic vinegar, water, and brown sugar. Whisk together until blended.
In the pan over medium heat, add and heat another 1 tablespoon of oil as needed.
Add ginger and cook, stirring regularly, until fragrant.
Add eggplants and green onions and cook for about 30 seconds, stirring regularly.
Add chili garlic sauce mixture and bring to a boil. Continue to cook for about 2 to 3 minutes or until the sauce is reduced.
Season with salt to taste. Serve hot.