Combine soy sauce, fish sauce, sugar and pepper in a small bowl. Set aside. Steam 1 inch cubes of eggplant until tender. Set aside.
Heat wok over high heat until hot. Add oil and swirl to coat. Add eggplant and stir fry for 10-15 minutes or until golden. Transfer to a plate using a slotted spoon.
Add garlic and chilli to the wok and stir fry for 5 minutes. Add mince a stir fry for 5 minutes or until brown. Return eggplant to wok and add soy sauce mixture and coriander. Stir fry for 2 minutes or until sauce has thicken slightly.