Cooking such beef requires the simplest efforts. No seasoning required before cooking. Just a good cast iron pan, sear a few minutes on each side, and viola!
Japanese wagyu about 200grams, 1.5cm thick (if the wagyu is bigger, the prices are astronomical)
Method
1. Heat up a cast iron skillet to medium heat. 2. When skillet is smoking, lay wagyu steak on one side and sear for 2 minutes. flip over and sear for 1 minute on the other side for medium rare. For medium doneness, sear 2 minutes on the second side instead (there will be a lot of smoke in the kitchen when searing wagyu due to the fats, just be careful). 3. Take wagyu steak off skillet and place on plate and let it rest for 5 minutes. If required, sprinkle small amount of good sea salt on steak before serving. 4. Bon appetite!