Place the beef strips in a bowl and introduce the egg. Mix to coat the strips in the egg.
Add the corn flour, each salt and pepper and white pepper.
Mix all together to coat the strips. It will be a sticky mixture.
Heat the oil in a skillet or wok over a high flame until very hot.
You might need to work in two batches, so when the oil is hot, add in half of the meat strips, a strip at a time - and fry thoroughly.
Fry on high flame until golden brown and crispy. Don’t stir he meat so often as this reduces the quantity of crispiness you want. Fry the meat for around 5 or 6 minutes to crisp up.
Using a spider strainer or any straining spoon, remove the meat from the frying pan and place onto a paper towel to soak the extra oil.
Repeat the same procedure with the next batch.
In the same pan, add another 1/2 tbsp oil then add the sliced onion on medium flame and cook for 2 minutes until slightly softened.