This Japanese style mashed potato salad is a delicious twist on the classic, made rich and flavorful with Kewpie mayonnaise and fluffy Russet potatoes. These two ingredients are key to achieving the authentic taste and texture, but don’t worry if you don't have them on hand – you can easily swap Kewpie mayo for regular mayo mixed with a bit of sugar and rice vinegar, and use Yukon Golds for a creamier consistency.This recipe has slightly more dressing than what you might find in a traditional Japanese restaurant but I like the extra richness myself. You can cut back on the dressing if desired.