Using a mandoline, slice the cucumber lengthwise into 1/8 inch thick slices
Lay out a slice of cucumber vertically. Place fish slices and a slice of avocado horizontally across the cucumber. Set all of them right next to each other. You may need to trim off and pieces that are hanging over the edge of the cucumber
Roll the cucumber tightly until it overlaps itself.
At the overlap spot, poke a bamboo skewer into each side so you can slice it right down the middle to form two rolls.
Repeat the process until you have 12 finished rolls.
Combine wasabi powder with a bit of water to create desired consistency
I am working on a gluten free ponzu sauce, but you could mix wasabi into Coconut Aminos to dip it in. Or you can do what I did and use my Avocado Vinaigrette as a dipping sauce! http://kateshealthycupboard.com/gluten-free-recipes/avocado-vinaigrette/