Wash the cucumber thoroughly and slice it thinly.
Remove excess moisture from the tofu and dice it into cubes.
Drain the oil from the tuna using a strainer.
Lightly pan-fry the tofu and let it cool.
Add the cucumber, tofu, and tuna to a bowl and gently mix.
Season with salt, pepper, sesame oil, and other seasonings as desired.
Transfer to a plate to finish.