Step 1

Halve the cucumber and scoop out the seeds with a spoon. Slice the cucumber into ¼ inch thick half moons.

Step 2

Place the cucumber, tomatoes, red onion and parsley in a large bowl.

Step 3

For the vinaigrette, whisk together the olive oil, vinegar, garlic, oregano, mustard, salt and pepper in a small bowl.

Step 4

Pour the vinaigrette over the vegetables. Set aside for 30 minutes to allow the flavors to blend. Serve at room temperature.