Stir-fried Beef Sirloin

Cut the beef sirloin into bite-sized pieces.

Prepare and slice vegetables such as onion and bell pepper.

In a bowl, marinate the beef sirloin with soy sauce, minced garlic, and black pepper.

Heat cooking oil in a pan over high heat and stir-fry the beef.

When the beef is about halfway cooked, add the vegetables and continue stir-frying together.

Adjust the seasoning by adding soy sauce, sugar, and other seasonings.

Once everything is cooked through, turn off the heat and serve on a plate.