In a shallow dish, combine the soy sauce, wasabi paste, and cracked black pepper; mix well. Add the tuna and turn until thoroughly coated on both sides; let sit for 10 minutes.
Comments: What is wasabi? Wasabi is Japanese horseradish, usually grated and served in paste form as a condiment for sashimi (raw seafood) and sushi. Since Japanese food, particularly sushi, has become a popular food option all across the U.S., we can now find wasabi paste in most supermarkets.