Optionally, pan-fry tofu strips with a bit of soy sauce until crispy.
Place a nori sheet on a bamboo mat, shiny side down. With wet hands, spread an even layer of rice over the nori, leaving a small space at the top.
Arrange strips of tofu, avocado, cucumber, and carrot on the rice. Roll the bamboo mat forward, pressing the ingredients to form a tight roll.