Slice the beef thinly.
Make the marinade with soy sauce, sugar, minced garlic, sesame oil, and pepper.
Add the marinade to the beef and let it marinate for 30 minutes.
Slice onions, carrots, and green onions into thin strips.
Heat oil in a pan and stir-fry the marinated beef and vegetables.
Once the meat is fully cooked, sprinkle with sesame seeds to finish.