for the teriyaki glaze

1. Whisk the brown sugar, mirin, sake and soy sauce in a bowl. Set aside.
2. Warm the toasted sesame oil in a small saucepan over medium heat. Add in the ginger, making sure it’s coated well with the oil. Saute for 1 minute only.
3. Pour the contents of the bowl into the saucepan, whisking it initially to dissolve the sugar. Once it comes to a small boil, reduce the heat to its lowest setting. Allow to reduce for 30-35 minutes, whisking it occasionally, then remove from the heat.
4. Chill the teriyaki sauce to allow it to thicken before using. If it becomes too thick (it will be thicker if you did not use sake), a few seconds in the microwave will loosen it up enough to pour.

for the sushi rice

1. Place the rice and water into a rice cooker and cook according to the manufacturer instructions. Once done, season with the rice vinegar, sugar and salt and set aside to cool.

for the sweet potato tempura

1. Place several inches of oil into a small, cast iron pot (I like this one). Bring it to 350 degrees over medium-high heat. The oil will be ready to use in 5-7 minutes. You can tell when it’s ready by inserting a dry chopstick into the hot oil so it touches the bottom of the pot. If bubbles form around it immediately, you are ready to fry.
2. Combine the VeganEgg and cold fizzy water.
3. Add in the flour and gently combine with chopsticks. Some lumps are okay. Don’t overmix or the tempura will become dense.
4. Working in small batches, dunk the potato slices into the batter and place carefully into the oil. Fry until golden and transfer to paper towels to drain while you fry the rest. Sprinkle with some of the salt while the oil is still glistening.

to assemble and finish

1. To assemble the rolls, divide the cooled rice into 4 portions. Slide a sushi mat into a large Ziploc bag or cover with plastic wrap. Place one sheet of nori, shiny side down, on the mat. Moisten your fingers with some water to prevent rice from sticking to them, then spread the rice evenly over the nori sheet, leaving about an inch exposed at the top. Sprinkle with a tablespoon of sesame seeds.
2. With the exposed end away from you, place 2 or 3 pieces of sweet potato tempura in a line along the side closest to you. Add a couple slices of avocado and some mayo, if desired.
3. Roll the sushi away from you, gripping the mat tightly but gently. Once rolled, seal the end with water or add a few grains of rice to the end to help seal.
4. Now cut the sushi in half with a very sharp knife (I run the blade under scalding water for a cleaner cut), then each half into halves, then those halves into halves to make 8 pieces.
5. Place onto a serving plate, repeating the process to make 4 rolls.
6. Slather the tops with the teriyaki glaze, serving with wasabi and pickled ginger, if desired.