This refers to sushi made by spreading vinegared rice over the dried seaweed, placing fillings such as cucumber, omelet, etc. on it, and rolling it with makisu ("sushi mat," bamboo mat used in food preparation).
海苔の上に酢飯を乗せ、その上にキュウリ、卵焼きなどの具を乗せて巻き簾）を使用し巻いたもの。