However, because Edomae-zushi was invented in the era when no refrigeration technology was available, there exist various techniques to process materials for the toppings such as sujime (marinating in vinegar) or shoyu-zuke (pickling in soy sauce).
しかしながら、冷蔵技術の無い時代に誕生したがゆえ、酢〆にしたり醤油漬けにしたりと、タネにさまざまに「仕事」をする技法がある。