Cut beef and vegetables into bite-sized pieces.
Add oil to a pan and stir-fry the beef.
When the beef is halfway cooked, add vegetables such as carrots, onions, and broccoli and continue to stir-fry.
Season with soy sauce, garlic, and pepper.
Cover with a lid and simmer on low heat for 10 minutes.
Once the vegetables and beef are tender, it's ready to serve.