Start by washing the cucumbers and tomatoes under cold water and slice the cucumbers into thin rounds or half-moons, then chop the tomatoes into bite-sized pieces.

Slice the red onion into thin half-moons and soak in cold water for about 10 minutes for a milder taste.

In a large mixing bowl, combine the sliced cucumbers, chopped tomatoes, and drained red onions. Gently toss to mix evenly.

In a separate bowl, whisk together the olive oil, vinegar or lemon juice, salt, and pepper. If using, add minced garlic.

Drizzle the dressing over the vegetable mixture and gently toss everything together.

Sprinkle chopped parsley over the salad and lightly toss again to distribute.

Let the salad rest for 10-15 minutes before serving for flavors to meld.