1. Let the steaks sit at room temperature for 30 minutes before cooking.
2. Sprinkle both sides with salt and pepper.
3. Mix the sauce ingredients.
4. Cut the carrots, onions, and mushrooms. Add the oil to the pan, and fry carrots, onions, mushrooms, and bean sprouts individually. Put them on the plate.
5. On the same pan, skip the oil and cook wagyu steaks for 4-6 minutes per side for medium rare. Slice the steaks and add to the plate.
6. Serve with rice.