Add all the marinade soy sauce ingredients into a small bowl and stir well to dissolve all sugar.
Cut tofu into 8 slices of 1 x 2 inchess by ¼ inch thick.
Arrange tofu slices onto a flatten dish or tray.
Spoon and lather the marinade soy sauce onto tofu surface.
Marinade or chill for 20-30 minutes
Heat high-temperature oil in a saute pan.
Pan-fry marinade tofu until their edges and surface are golden and semi-crusted.
Transfer out to plate and let cool down a bit.
In the mean time, prepare carrot, cut avocado, and seasoned sushi rice with sushi vinegar.
Season sushi rice with sushi vinegar or equivalent mixture of salt/sugar/vinegar.
Lay a piece of nori over bamboo mat on a flat surface.
Spread sushi rice all over nori leaving about half inch gap near one end.
Arrange tofu, avocado and carrot as filling.
Lift, tuck and roll into maki sushi roll.
Slice and serve as is.