Cut the beef and vegetables into bite-sized pieces.
Add cooking oil to a pan and preheat over medium heat.
Add the beef and stir-fry until the surface is cooked.
Add the vegetables (carrots, onions) and stir-fry together.
Season with soy sauce, sugar, and garlic.
Stir-fry until all ingredients are cooked through and the seasoning is well absorbed.
Transfer to a plate to serve.