Wash rice, soak in water for 30 minutes, remove rice and dry. Toast rice in a pan over medium heat with spices until rice is dry. Process in a blender until rice is 1/3 its original size.
Marinate beef 20 to 30 minutes in sauce. Coat beef all over with rice mix, drizzle with a little oil and steam approx 20 to 30 minutes.
In a cast iron pan, roast filet until desired temperature, basting with butter. Remove from heat and rest the steak approximately 10 minutes, slice and season with fresh wasabi and soy sauce on the side.