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In a bowl, combine 10 tbsp soy sauce, 6 tbsp sugar, 2 tbsp starch syrup, 1.5 tbsp minced garlic, 3 tbsp sesame oil, and 2 tbsp vinegar, and mix well with a spoon to make the bulgogi sauce.

Ryu Soo-young's (Eonam-seonsaeng) foolproof beef bulgogi recipe that doesn't require marinating.
In a bowl, combine 10 tbsp soy sauce, 6 tbsp sugar, 2 tbsp starch syrup, 1.5 tbsp minced garlic, 3 tbsp sesame oil, and 2 tbsp vinegar, and mix well with a spoon to make the bulgogi sauce.
Julienne 1 onion and slice 1 green onion diagonally.
Heat the pan, add oil, and stir-fry the julienned onion first to extract the onion juice.
Add 600g of beef to the pan and stir-fry until the red color disappears.
Once the meat is cooked, add an appropriate amount of the prepared bulgogi sauce and stir-fry so the meat absorbs the flavor.
Add the sliced green onion and mushrooms and stir-fry together to finish.