For tuna: In a zip-top bag, combine soy sauce, sesame oil and 2 Tbsp. Asian Style Sesame Sprinkle. Add tuna steaks and marinate for 1 to 2 hours. Remove tuna from marinade and dust with remaining 1 Tbsp. Asian Style Sesame Sprinkle. Sear on high heat (either on grill or in saute pan) for 30 seconds per side, or longer for more well-done fish. Remove from heat and slice against the grain into thin slices. Arrange on plate and set aside.
For wasabi cream: Combine all ingredients and mix thoroughly until a smooth and creamy green paste is achieved. Place a dollop of wasabi cream on each slice of seared tuna.
Serve as is for a finger food appetizer or with sushi rice for a main meal.