This is an easy recipe and a different twist on regular mashed potatoes. They make a nice side dish to accompany something Japanese or Asian. The amount of wasabi used is really up to personal taste. I like lots but my wife doesn't; so I went light. I had more wasabi at the table for me. Like they say--happy wife, happy life. I used red potatoes which are lower in starch than russet but any type would work. You may want to vary the amount of milk used depending on the consistency you like in the final product. I served them with fried wasabi green peas to add some crunch.