Marinate the beef in red wine, grated onion, grated garlic, soy sauce, balsamic vinegar, sugar, and mirin.

If the meat is tough, pound the meat to tenderize it.

Heat vegetable oil and butter in a pan over medium-high heat.

Season the beef with salt and pepper.

Pan-fry the beef over high heat to sear the surface.

Adjust the heat to your desired level of doneness and continue cooking.

Remove the beef from the pan and set aside.

Wipe the pan clean.

Pour the marinade into the pan and simmer to reduce.

Add butter to the sauce to finish.

Pour the sauce over the beef steak and serve.

Serve with rice for a delicious rice bowl.