Prepare the vegetables: Slice the broccolini, bell peppers, onion, and chili peppers. Heat a large pan over medium heat and add 2 tablespoons of pork lard (or your preferred oil). Once heated, add the vegetables with 1 teaspoon of salt and sauté for about 15 minutes until softened. Remove from the pan and set aside.

Cook the steak: In the same pan, add the sliced flank steak and season with the remaining 1 teaspoon of salt. Cook over medium heat for 5–10 minutes, or until the steak is fully cooked and browned. Add the sautéed vegetables back to the pan and mix everything together.

Make the sauce: In a small bowl, whisk together the mayonnaise, smoked paprika, garlic powder, soy sauce, oyster sauce, cornstarch, and hot water until smooth.

Combine and simmer: Pour the sauce over the steak and vegetables in the pan, stirring to coat everything evenly. Let it simmer for 5–10 minutes, allowing the sauce to thicken.

Serve: Once the sauce has thickened to your desired consistency, serve the stir fry over steamed rice and enjoy!