Spice Islands Gourmet Blends Wasabi combines high-quality dried wasabi with horseradish and mustard to create a flavor that's truer to fresh wasabi. And, unlike some brands, Spice Islands doesn't add food coloring to their wasabi blend. Often called Japanese horseradish, wasabi has a biting flavor that's strong, but cleansing. Add it to a small amount of cold water and let it stand for 10 minutes to develop its full potency.