Wash all produce under cold running water.

Dice the tomatoes into medium-sized pieces.

Slice the cucumbers into thin rounds.

Finely chop the red onion.

In a large mixing bowl, combine the diced tomatoes, sliced cucumbers, and chopped red onion. Toss gently.

Set aside while preparing the dressing.

Whisk together olive oil, lemon juice, salt, and pepper in a small bowl.

Drizzle over the vegetable mixture and toss gently.

Allow to marinate for 15-30 minutes in the refrigerator if desired.

Transfer to a serving platter, sprinkle with fresh herbs if using, and serve.

Serve chilled or at room temperature for a refreshing accompaniment.