Cut the tofu into cubes.
Clean and cut the seafood into bite-sized pieces.
Chop the onion and green onion.
Heat oil in a pan, then stir-fry the green onion and onion.
Add the seafood and stir-fry, then add the tofu and stir-fry further.
Season with soy sauce, oyster sauce, and pepper.
Add a little water and simmer until the ingredients are well mixed.
Finish by thickening the sauce with starch water.