Wash all the vegetables thoroughly.
Chop the romaine lettuce into bite-sized pieces.
Halve the cherry tomatoes and set aside.
Dice the cucumber and add it to a mixing bowl.
Finely chop the red onion and incorporate it with the cucumbers.
Slice the Kalamata olives and add them to the mixture.
Crumble the feta cheese over the salad.
Chop the fresh parsley and sprinkle it on top.
In a separate bowl, whisk together the olive oil and red wine vinegar.
Drizzle the dressing over the salad, then toss gently to combine all ingredients.