Slice 3 cloves of garlic and prepare 1/2 tbsp of minced garlic.Thinly slice the green onion diagonally and julienne (thinly slice) the onion.
Mix the sauce ingredients in advance and set aside.
Drizzle cooking oil in a pan and stir-fry the meat over medium heat. Since the meat is frozen, sprinkle black pepper while cooking to remove any potential gamey smell.Once fully cooked, temporarily remove the meat from the pan.
Change the heat to low and stir-fry the green onion, sliced garlic, minced garlic, and onion in the leftover beef fat.
When the onions become slightly translucent, add the meat, bean sprouts, and the sauce. Stir-fry quickly over high heat to evaporate excess moisture.At this point, using a kitchen torch while cooking can add a smoky fire flavor. Stir-fry for less than 1 minute to keep the bean sprouts crunchy.
Transfer to a plate and sprinkle with chili pepper and toasted sesame seeds according to your preference.