Cut ends of cucumbers off and discard.
Slice cucumber in half, then slice the halves in half.
Dice cucumbers and add to a large bowl.
Slice tomatoes in half and add to cucumbers.
Thinly slice red onion and add to bowl of cucumbers.
Season cucumber mixture with salt and pepper then mix well.
Add all dressing ingredients to a food processor (or blender). Pulse until all ingredients are mixed.
Pour dressing on top of cucumber mixture.
Garnish top with fresh basil and feta cheese.