In a bowl, mix the beef with cornflour, egg white, and a pinch of salt. Toss it like you mean it—get everything coated.
Heat enough oil in a deep pan or wok. Fry the beef in batches until golden and crisp. Don’t overcrowd the pan—you want sizzle, not a soggy spa.
Remove the beef and let it rest on a plate lined with paper towels. Try not to eat all the crispy bits. It’s harder than it sounds.
Pour out most of the oil, leaving just a little. Add the garlic, ginger, and chilli. Stir-fry for a minute or until your kitchen smells like takeout heaven.
Throw in the sliced red pepper. Cook it until it’s soft but still has a little bite.
Add soy sauce, sweet chilli sauce, rice vinegar, and brown sugar. Stir everything together until glossy and irresistible.
Return the beef to the pan. Toss to coat in that glorious sauce. Don’t be shy—make it sticky.
Serve over hot rice, then top with spring onions and sesame seeds. Grab a fork and don’t look back.