Wipe off excess oil from the fried tofu using a paper towel. Cut it in half lengthwise, then slice into 1cm wide pieces.

Cut the napa cabbage in half lengthwise, then slice into 1cm wide pieces. Thinly julienne the ginger.

Bring water and dashi powder to a boil in a pot. Add the fried tofu, ginger, and napa cabbage. Cook over medium heat for about 2 minutes until the cabbage softens.