Mash the potatoes with a fork. Add the salt, wasabi, rice wine vinegar, mustard, and mustard oil. Let cool down and set aside. Roll out the potatoes 1/2-inch by inches wide cut into 1-inch pieces put 1 tail of crayfish on top of each potato piece. Serve warm.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Recipe courtesy of Marcus Sameulsson, Aquavit Restaurant