Prepare the Beef: Cut beef into thin strips. In a bowl, combine beef with salt, soy sauce, black pepper, egg, and cornstarch. Mix well and set aside to marinate.
Cook the Beef: Heat olive oil in a skillet. Add marinated beef and cook until golden brown. Remove from skillet and set aside.
Saute Vegetables: In the same skillet, add more olive oil. Saute red bell pepper until slightly wilted, then add onion and cook until golden brown.
Combine and Finish: Return beef to skillet with vegetables. Stir in soy sauce, alcohol vinegar, and sugar. Combine cornstarch with water and add to thicken sauce. Add garlic and chili, cook for 5 minutes.
Serve: Transfer beef and vegetables to a plate. Garnish with parsley and serve with rice or noodles.