Toss the sliced beef with 1 tbsp of the soy sauce. Leave it while you chop.
Get a pan properly hot. Sear the beef 90 seconds a side, then remove. It should still be pink inside; it finishes later.
Same pan, olive oil, then broccoli, pepper, onion. High heat, 5 minutes, stirring. Splash of water and a lid for 2 minutes to steam the broccoli through.
Garlic, ginger, chili flakes, 30 seconds.
Beef back in with remaining soy sauce and sesame oil. Toss 1 minute.
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