Heat about 1 inch / 2. 5 cm of oil in a medium skillet over high heat to 350°F / 175°C.
Reduce the heat as needed to maintain this temperature. 2.
While the oil heats, prepare the mushrooms.
Cut 1 sheet of nori into 4 long, thin strips.
Divide the shimeji and enoki mushrooms into 4 equal piles. 3. To create a mushroom “spider,” take one pile and turn half the mushrooms around so the caps face the opposite direction. Use a nori strip to tightly bind the bundle in the center, creating the body with legs sticking out both ends.
Repeat for all 4 bundles. 4. Lightly dust each mushroom “spider” with potato starch or cornstarch, shaking off any excess. 5.
Dip each dusted bundle into the Vegan Tempura Batter, ensuring it's fully coated. 6. Carefully place the battered mushrooms into the hot oil and fry until golden brown and crisp.
Transfer to a wire rack to drain any excess oil. 7. To assemble, place a remaining sheet of nori vertically on a bamboo rolling mat, rough side up. Lightly wet your fingertips and spread ¾ cup / 150 g (5.3 oz) of sushi rice evenly over the bottom three-quarters of the nori. 8. Smear 1 tablespoon (15 ml / 0.5 fl oz) of Faux Roe (if using) in a line across the center of the rice.
Place a fried mushroom “spider” on top, allowing the ends to stick out.
Add ¼ of the cucumber matchsticks, daikon matchsticks, and a half leaf of romaine lettuce. 9. Begin rolling by sliding your thumbs under the mat and using your fingers to hold the fillings in place.
Roll the bottom edge of the mat up and over the fillings, tucking them in tightly. 10.
Continue rolling forward, applying gentle pressure, until the roll is sealed. Use the mat to gently press and shape the roll into a firm cylinder. 11.
Let the roll rest seam-side down on a cutting board for at least 2 minutes.
Repeat with the remaining to make 3 more rolls. 12. To serve, dip the blade of a very sharp knife in water.
Slice each roll into 5 pieces using a swift, gentle sawing motion.
Arrange on a platter and serve immediately.
Don't overcrowd the pan when frying the mushrooms.
Frying in batches ensures the oil temperature stays high, resulting in a crispier, less greasy tempura.
Keep a small bowl of water (tezu) nearby when handling sushi rice.
Dipping your fingers prevents the rice from sticking to them, making it much easier to spread evenly on the nori.