Begin by preparing all your ingredients. Slice the beef thinly against the grain to ensure tenderness. Chop your bell peppers and onions, and mince the garlic and ginger.

In a large skillet or wok, heat the vegetable oil over medium-high heat. You want it hot enough to sear the beef but not too hot that it smokes excessively.

Add the sliced beef to the pan in a single layer. Allow it to sear for a couple of minutes without stirring, then flip to cook other sides for another 2-3 minutes until browned. Remove from the pan and set aside.

In the same pan, add a touch more oil if necessary, and add the onions, green and red bell peppers. Stir-fry for about 3-4 minutes until they’re tender-crisp.

Add the garlic and ginger, stirring for about 30 seconds until fragrant. Then return the beef to the pan. Add the soy sauce, black pepper, and salt, stirring everything together to combine. Cook for another 1-2 minutes until everything is heated through.

Remove from heat and serve hot over steamed rice or noodles.