Heat the cooking oil in a pan. Add the beef and cook over high heat, stirring to separate the strips, until the beef changes color.
Add the sliced onion and chopped garlic. Pour in the soy sauce. Sprinkle with black pepper. Stir. Cook for 30 seconds.
Throw in the asparagus. Stir and cook for about a minute.
Add the corn kernels. Stir. Cook for 30 seconds or until the corn is heated through.
Pour in the oyster sauce. Stir to blend.
Turn off the heat. Drizzle the sesame seed oil and stir.