Wash the cucumber and carrot thoroughly, then julienne them into bite-sized pieces.
Drain the oil from the canned tuna using a strainer.
Add a little cooking oil to a pan and sauté the carrot first.
When the carrot softens, add the cucumber and sauté briefly.
Add the tuna and stir-fry until all the ingredients are well mixed.
Season with salt and pepper to taste, and it's ready to serve.