Since steaming too long causes the eggs to coagulate too much, which results in holes forming in the tamago dofu, it is advisable to place a cloth over the steamer pot and place the pot lid on the cloth so as not to cover the pot tightly.
蒸しすぎると卵が凝固しすぎてしまい隙間（鬆）ができるため、蒸し器のふたはずらしてふきんをはさむとよい。