In a saucepan over medium-low heat, combine soy sauce, oyster sauce, chili paste, black pepper, garlic, ginger, brown sugar, and rice vinegar. Stir and bring to a simmer.
Dissolve cornstarch in water and add it to the pan, stirring until the sauce thickens.
Remove the sauce from heat once it reaches the desired consistency and transfer it to a bowl.
In a skillet or large pan over medium-high heat, melt a tablespoon of butter or heat oil. Place a serving of rice in the center and surround it with thinly sliced steak.
Drizzle the desired amount of sauce over the steak.
Cook for 5 to 7 minutes or until the steak reaches your preferred level of doneness.
Add corn and green onions on top, and finish with cracked black pepper. Enjoy your sizzling homemade Pepper Lunch!