Most Wasabi is powdered horseradish, how ever it varies greatly from brand to brand - so you will need to adjust the Wasabi according to your brand and your preference. Cooking time is chilling time. Herb butters are a nifty way to spice up any meal. I like herbed butters as a quick easy way to flavor frozen or canned veggies. Just add a dab of herbed butter and heat up the veggies. You can substitute margarine for the butter. If you choose to use dried herbs instead of fresh use 1 1/2 times the amount called for.