Cut the aubergine lengthways into slices and brush them lightly with oil on both sides. Preheat the frying pan, add 4-5 slices each time, fry until golden brown on both sides and remove from the pan. Do not fry too quickly, as slow cooking will caramelize the eggplant`s sugar and create a wonderful taste. If the aubergine should burn, reduce the heat immediately and moisten with a little water. Remove the aubergine slices from the pan and set aside.
Add the remaining oil, garlic, ginger, onions and about 1 tablespoon of chicken stock to the hot pan. Cover and cook for 3 minutes. Add the rest of the broth, black beans, oyster, soy and fish sauce. Bring to the boil and continue cooking for 2 minutes. Return the aubergine to the pan and cook for 2 minutes to reheat.
Scatter spring onions on top and serve.
Always rinse black beans well before preparing them as they are very salty.