In a mixing bowl, combine the thinly sliced flank steak with soy sauce, sesame oil, and a sprinkle of salt and pepper. Allow the beef to marinate for about 15-20 minutes at room temperature to absorb the flavors.
Once marinated, sprinkle the cornstarch over the flank steak slices. Use your hands or a spoon to evenly coat each piece, ensuring a good layer of cornstarch to achieve that delightful crispy texture when fried.
In a large frying pan or wok, pour enough vegetable oil to cover the bottom of the pan (about 1/4 inch deep). Heat the oil over medium-high heat until it shimmers but is not smoking—this indicates it’s ready for frying.
Carefully add the coated beef slices in batches, making sure not to overcrowd the pan. Fry each batch for about 3-4 minutes on each side or until the beef is golden brown and crispy. Once done, remove the beef from the pan and drain on paper towels to absorb excess oil.
In the same pan, carefully remove any excess oil, leaving about a tablespoon for flavor. Add the minced garlic and ginger, sautéing for 30 seconds until fragrant. Next, toss in the sliced bell peppers and stir-fry for 2-3 minutes until they are tender yet still crisp.
Return the crispy beef to the pan with the sautéed vegetables. Stir in the chili paste and honey, tossing everything together until the beef and vegetables are well coated. Cook for an additional minute to meld the flavors.
Add the chopped green onions to the pan and give a final stir to combine. Taste the mixture and adjust seasonings with additional salt, pepper, or chili paste as desired.
Carefully transfer the crispy chilli beef onto a serving platter. Garnish generously with sesame seeds, providing an appealing contrast and a nutty flavor.
Notes
Serve with steamed rice or noodles for a complete meal.