Wash cucumbers and tomatoes under cold water. Slice cucumbers into thin rounds or half-moons, and tomatoes into bite-sized pieces.

Thinly slice the red onion. Soak in cold water for 10 minutes to mellow the flavor before draining.

In a mixing bowl, combine cucumbers, tomatoes, and red onion. Toss gently.

In a separate bowl, whisk together olive oil, vinegar or lemon juice, salt, and pepper. Add garlic if using.

Pour dressing over the salad mixture and toss gently to combine.

Sprinkle fresh herbs over the salad and toss again.

Serve immediately or let it sit for 10-15 minutes before serving.