Season rice with rice vinegar, sugar, salt, and sesame seeds
Mix crab with mayo
Prep remaining fillings
Place half sheet of gim, shiny side down
Dip 1 rice paper in water and place on the bottom
Add rice, crab, cucumber, avocado, and masago
Fold rice paper up first, then roll tightly with gim
Seal with a little water
Slice and serve with wasabi mayo
