Place the eggplant wedges in a bowl, add salt, toss to coat, let sit for 5-10 minutes to draw the moisture out.
Meantime, make the sauce. In a bowl, combine soy sauce, oyster sauce, rice vinegar, brown sugar, and cornstarch. Mix until the sugar and cornstarch dissolve. Set it aside.
Check the eggplant, when it starts sweating or you see moisture, place them on a strainer and rinse with water thoroughly.
Place a paper towel on a sheet pan and dump the eggplant onto it. Get another piece of paper towel, dry them well. Coat the eggplant with cornstarch, toss, make sure all pieces are well coated.
Heat a skillet with 3 tablespoons of oil. Add the eggplant, fry for 2 minutes on each side or until golden brown. If the pan is drying out, add more oil to avoid sticking. Fry in batches. Remove from heat and set them aside.
Use the same pan, add 2 tablespoons of oil. Add the onion saute until tender. Add the garlic and ginger, continue sauteing until fragrant. Add the chili, continue stirring, cook until tender.
Add the fried eggplant back into the pan. Add the sauce, stir, simmer for a minute or until the sauce thickened.
Drizzle the sesame oil. Turn off the heat, garnish with cilantro and sprinkle sesame seeds on top.