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Export 7 ingredients for grocery delivery
Slice the cooked steak into thin strips, trimming off any fat around it if desired.
Combine oyster sauce, soy sauce, fish sauce and water in a small bowl and stir to combine.
Add just enough oil in a wok to coat the bottom, then add the garlic and saute over medium heat until the smallest bits start to turn golden.
Add the black pepper and stir to mix with the oil. Add onions and bell pepper, and toss for about 1 minute or longer if you prefer the softer vegetables.
Once the vegetables are cooked almost to your liking, add the sauce and toss for about 10 seconds. Turn the heat up to high then add the sliced steak; if you like the doneness of the steak as is, just toss it briefly (20-30 seconds) until heated though, otherwise cook it longer to get the desired doneness. Since the steak is already cooked, you only need to cook it long enough to heat it through.