Creating amazing Crispy Chilli Beef can be straightforward if you follow these simple steps:

1. Prepare the Beef: Thinly slice the beef against the grain. This ensures tenderness when cooked.
2. Coat the Beef: In a bowl, combine cornstarch and flour. Dip each slice of beef first into the beaten egg, then coat it thoroughly with the flour mixture.
3. Heat the Oil: In a large frying pan or wok, heat the vegetable oil over medium-high heat.
4. Fry the Beef: In batches, fry the coated beef pieces until golden brown and crispy. Remove and drain on a paper towel.
5. Make the Sauce: In another pan, combine soy sauce, rice vinegar, sugar, chili paste, minced garlic, and ginger. Mix and heat until the sauce simmers.
6. Mix in the Vegetables: Add the sliced bell peppers to the sauce and cook for 2-3 minutes until they soften slightly.
7. Combine: Add the crispy beef to the sauce, tossing until all pieces are well-coated.
8. Garnish: Sprinkle with chopped green onions and sesame seeds before serving for extra flavor and appeal.

These steps allow you to effortlessly whip up this incredible dish!