1. Tap the Hanwoo Outside round back and forth with a bat, remove the blood with a paper towel, season it with salt and pepper oregano, and marinate it.
2. Put flour, egg water, and bread crumbs on the meat and fry them. Remove the oil from the fried beef cutlet with a paper towel.
3. Stir-fry sliced onions in a butter-covered pan until brown. Add the rest of the sauce ingredients and bring to a boil.