Ingredients:
500g beef (tenderloin or sirloin), thinly sliced 
3 large onions, sliced 
2 cloves garlic, minced 
3 tbsp soy sauce 
1 tbsp oyster sauce (optional) 
1 tsp brown sugar or honey 
2 tbsp oil (sunflower or sesame) 
1 tbsp cornstarch 
3 tbsp water 
Salt and pepper, to taste 
Fresh spring onions or coriander to garnish (optional) 
Instructions:
Prepare the beef:In a bowl, toss the beef strips with 1 tablespoon of soy sauce, the cornstarch, and 1 tablespoon of water. Let marinate for 15 minutes. 
Sauté the onions:Heat 1 tablespoon of oil in a large skillet or wok over medium heat. Add the sliced onions and sauté for 5-7 minutes, until soft and lightly browned. Remove from the pan and set aside.
Sear the beef:In the same pan, add another tablespoon of oil and increase the heat. Add the marinated beef strips in a single layer. Cook quickly for 2-3 minutes, turning so they are browned but still tender. 
Make the sauce:Return the onions to the pan with the beef. Add the minced garlic, remaining soy sauce, oyster sauce, sugar or honey, and 2 tablespoons of water. Mix well to coat the beef and onions. Simmer over medium heat for 2-3 minutes.
Serve hot:Arrange the stir-fried beef with onions on a platter or plates. Garnish with fresh spring onions or coriander if desired. Serve with white rice for a complete and tasty meal. 
Time:
Prep: 15 minutes
Cook: 15 minutes
Total: 30 minutes
Calories:
Approx. 320 Kcal per serving (for 4 servings).