Cut the feta into cubes that are not too small, otherwise they will crumble. Also cut the cucumber and tomatoes into cubes and place in a bowl and mix. Now add the tuna with the oil and mix well again. If you like, you can season a little with pepper (be careful with salt, feta is very salty in itself).
It`s a very quick, summery recipe that everyone likes at parties.
Tip:
If you don`t have tuna with oil, just add a little olive oil. In this case, however, do not add the tuna juice to the salad.