Heat the cooking oil.
Saute the garlic and onion just until fragrant, about 30 seconds.
Add the fried tofu and baby corn. Pour in the soy sauce, oyster sauce and Kecap manis (and the starch solution, if using).
Add a generous amount of freshly ground pepper.
Stir fry just until blended.
Transfer to a serving platter and sprinkle with chopped onion leaves. Serve at once.