In the same skillet/wok, add another tablespoon of oil and place on medium heat.
Toss in the chopped onions, green bell pepper, and green chilies. Stir-fry for a few minutes or until they begin to soften.
Add ginger-garlic paste and sauté for about a minute until fragrant.
Next, add soy sauce, tomato ketchup, vinegar, and chili sauce, and stir to combine all ingredients.
Pour in beef or chicken broth and let the mixture simmer for about seven minutes.
Season with red chili flakes, salt, and black pepper according to taste or preference.
Add the cooked steak slices to the sauce and mix well to properly coat the beef with the flavorful sauce.