Preparing Crispy Chilli Beef Rice can be a breeze if you follow these straightforward steps:

1. Prepare the Beef: Slice the beef sirloin into thin strips. Season with salt and pepper.
2. Coat the Beef: Toss the beef strips in cornstarch until coated evenly. This will give them a delightful crispiness when fried.
3. Heat the Oil: In a large frying pan or wok, heat 2-3 tablespoons of vegetable oil over medium-high heat.
4. Fry the Beef: Add the coated beef to the pan in a single layer. Fry until golden brown and crispy, about 4-5 minutes. Remove the beef and set aside on a paper towel to drain excess oil.
5. Stir-Fry Vegetables: In the same pan, add a touch more oil if necessary. Add the garlic and ginger, sautéing for about 30 seconds until fragrant.
6. Add the Bell Peppers and Onion: Next, toss in the sliced bell peppers and onions. Stir-fry for 2-3 minutes until they soften.
7. Combine the Sauce: In a bowl, mix together the soy sauce, sweet chili sauce, and sriracha. Pour this sauce over the vegetables in the pan and stir well.
8. Add the Beef and Rice: Return the crispy beef to the pan along with the cooked rice. Mix everything thoroughly until heated through and well combined.
9. Adjust Seasoning: Taste and adjust the seasoning with extra salt, pepper, or more chili sauce if desired.
10. Serve: Transfer to a serving dish and garnish with fresh coriander if using.

With these steps, you are well on your way to enjoying a plate of Crispy Chilli Beef Rice.