Finely chop half the onion and thinly slice the other half. Mix breadcrumbs and milk in a bowl.

Microwave the minced onion for 2 minutes at 600W, then let it cool.

Combine the minced onion, ground meat, egg, salt, and pepper in a bowl. Mix until sticky and form into two oval patties.

Heat salad oil in a pan over medium heat. Cook the patties until browned on both sides, then cover and cook on low heat for 8 minutes. Remove from the pan.

Cut the carrot and king oyster mushroom into bite-sized pieces. Microwave the green beans for 1 minute at 600W, then cool and cut into thirds.

Heat butter in a pan over medium heat. Sauté the sliced onion until translucent, then add carrot and mushrooms. Stir until coated with butter.

Add demi-glace sauce, ketchup, red wine, salt, pepper, and water to the pan. Cover and simmer on low heat for 8 minutes.

Return the patties to the pan and spoon the sauce over them. Simmer for 5 minutes.