Cook brown rice and let it cool.
Cut cucumber, carrot, and bell pepper into thin strips.
Wash lettuce and perilla leaves and remove excess water.
Grill tofu in a pan without oil and let it cool.
Evenly spread brown rice on a sheet of seaweed.
Place lettuce, perilla leaves, cucumber, carrot, bell pepper, and tofu on top of the rice.
Roll the ingredients tightly to form the gimbap.
Cut into bite-sized pieces.