Wash and prep the vegetables. Rinse cucumbers and tomatoes under cold water. Slice cucumbers into rounds and cut tomatoes into bite-sized chunks. Set aside in a mixing bowl.

Slice the red onion thinly. Optionally soak sliced onion in iced water for about 10 minutes, then drain and mix with cucumbers and tomatoes.

Prepare the dressing by whisking together olive oil and vinegar. Add salt and pepper to taste, and whisk until emulsified.

Combine the vegetables and dressing by pouring the dressing over the salad and gently tossing to coat all ingredients.

Taste and adjust seasonings as needed. Add fresh herbs if desired.

Serve immediately or refrigerate for 15-30 minutes to enhance flavors before serving.