Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
3         pounds        russet potatoes -- cut in 2" cubes
3/4       cup           whole milk
1         tablespoon    wasabi powder -- (horseradish powder)
1/4       cup           butter

Preparation:

Place potatoes in large pot of cold salted water. Boil until tender, about 20 minutes. Drain. Return to pot; mash. Combine 3/4 cup milk and 1 tablespoon wasabi powder in small bowl. Stir in dissolve powder. Add milk mixture and butter to potatoes. Using electric mixer, beat potatoes until fluffy and smooth. Season potatoes to taste with salt and pepper. (Can be prepared 2 days ahead.)