Slice the steak and vegetables

• Slice the flank steak thinly against the grain and season with salt and black pepper.
• Slice the onion and the yellow, red and green bell peppers.
• Mince the garlic and grate the ginger.

Mix the sauce

• In a bowl, combine the soy sauce, dark soy sauce, oyster sauce, sugar and paprika.
• Stir until the sugar dissolves.

Sear the beef

• Heat oil in a hot pan or wok.
• Sear the steak in a single layer until browned, then set aside.

Stir-fry the vegetables

• Add a little more oil to the pan.
• Stir-fry the onion, bell peppers, ginger and garlic until crisp-tender.

Combine and glaze

• Return the beef to the pan.
• Pour in the sauce and toss until everything is coated and glossy.

Serve

• Serve hot over rice or noodles.