Now prepare the Seasoned Sushi Rice and let it cool to room temperature. Make Sweet Carrots: Combine the carrots, sugar, and water in a large non-stick pan. Set the heat to high and bring it to a boil. Cook carrots until all the water is absorbed and they become tender about 15-20 mins. Cook Spinach: Bring a large pot of water to a boil. Add the spinach and let it wilt for 1-2 minutes. Drain the spinach and rinse it under cold water. Using your hands, squeeze out any excess water from the spinach.
Cut Cucumbers: Start by slicing off both ends. Then, cut the cucumber lengthwise in half and remove the seeds. Proceed to cut the cucumber into long narrow strips.
Vegan Sakura Denbu: Begin by grinding the roasted chickpeas, sugar, and pink gel food colouring in a mini food processor. Once ground, transfer it to a fine mesh strainer and gently tap the side with one hand to sift the mixture. Remove any large chunks and discard them.
Assembling Rolls: Place the seaweed sheet, rough side up, on a plastic-wrapped bamboo mat. Spread 1 1/2 cups of sushi rice evenly, leaving a 1/2-inch space at the top. Arrange fillings in the center of the rice. Start with strips of tamagoyaki, cucumber, carrots, mushrooms, spinach and then add a few tbsps of sakura denbu.
Lift the edge of the bamboo mat closest to you, fold it over the filling, apply light pressure to tighten the roll, and then wet your finger with water to moisten the uncovered nori as glue.
Continue rolling the sushi to seal completely. Using the mat apply gentle pressure with both hands to shape the roll.
Cut the sushi roll into 8-10 pieces with a slightly wet, sharp knife in a back-and-forth motion.