Thinly slice the beef against the grain for tender result.
Marinate and mix the beef with oyster sauce, oil, cornstarch, sugar and baking soda.Leave it atleast 30 minutes Cut, core and seeded the bell pepper
Chop the garlic into thin pcs
Chop the ginger finely
Slice onion's into julienne
Combine oyster sauce, soy sauce, water and cornstarch and mix well.
Heat the in medium high heat and add oil, ensure it's hot enough before adding the beef.
Sear the beef by batches for better result and set aside.
on same skillet add oil and heat to mediuim high heat add the ginger, onion and garlic, stir fry until onions become translucent and garlic start to release aroma.
Add the pepper and mix altogether.
Add the beef.
Stir the sauce and pour in to the pan.
Stir quickly to spread the sauce.
Once the sauce thicken turn off the heat and continue to stir.
Season with salt and pepper as desired.
Serve with hot plain rice.