2 cups of boiled potatoes.
1 tablespoon of mustard oil.
1 teaspoon of rice wine vinegar.
1 teaspoon of mustard.
½ teaspoon of salt.
½ teaspoon of wasabi.
½ cup of crayfish tails.

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With a fork, mash the boiled potatoes with a fork.

Add the mustard oil, vinegar, mustard, salt and wasabi.

Set aside and allow to cool.

Roll out the potatoes into appropriately sized pieces; placing a craytish tail on top of each piece.

Serve warm.

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Source: http://www.sushirecipes.org/crayfish-sushi.html