Cut the daikon radish into quarters lengthwise, then slice into 5mm thick pieces (quarter slices).

Pat the aburaage with a paper towel to remove excess oil, cut it in half, then slice diagonally into quarters.

Layer aburaage, canned tuna, and daikon radish in a microwave-safe container. Add the seasonings (soy sauce and chicken stock powder), cover loosely with plastic wrap, and microwave at 600W for 3 minutes.