Wagyu beef is known for its tender marbling, so it needs only a zesty spice crust to enhance the natural beef flavor.
Portion size: 8- to 10-oz. steak
Preheat a grill to high heat.
Toast all the spices in a sauté pan on medium heat for 1 minute, stirring constantly.
Grind the spices in a coffee grinder or with a mortar and pestle.
Season the steaks with a generous amount of salt and the spice blend. Leave the steaks at room temperature for 30 minutes to allow the spice to penetrate the beef.
Sear the steaks on the grill for 1 minute, then turn them a quarter turn every minute for 4 minutes to avoid burning the spice rub and to give a nice, even sear.
After 4 minutes, flip the steaks over and repeat the same process on the other side (8 rotations in total).
Cook until they reach a perfect Wagyu medium to medium-rare, approximately 130°F on a meat thermometer.
Allow the steaks to rest for 5 minutes, then serve immediately.