Prepare the Chicken: Mince the onion. Slice the chicken about a centimeter thick.
Fry Chicken Skin: Get the chicken oil out of the skin by frying it.
Cook Ingredients: Fry the chicken, onion, butter, cooked rice, and 40g of demi-glace sauce together.
Shape the Rice: Shape the rice using a rice scooper.
Make Egg Sheet: Beat the eggs, strain, and cook in a lightly oiled pan. Carefully fold both sides into the center and flip.
Assemble and Serve: Slice through the egg, place on top of the rice, pour the remaining demi-glace sauce over, and sprinkle with parsley.
Make Quick Demi-Glace Sauce: Melt butter in a pot, add flour, fry for 15 minutes, add hot water and bouillon gradually, then add ketchup, Worcestershire sauce, mirin, and onion paste. Boil for 20-30 minutes.