Here's the ingredients taken directly from their web site. It says wasabi powder so I think it's the real deal.
Wasabi Teriyaki
All natural ingredients: Preservative free soy sauce (water, wheat, soybeans, salt), sugar, expeller pressed soy oil, fresh garlic, sesame seeds, dried onion, fresh ginger, expeller pressed sesame oil, spices, natural flavors, wasabi powder.