1. Using a fork, whisk the vinegar and water together in large bowl. Add the salt and pepper and whisk to dissolve the salt. Gradually whisk in the oil.
2. Add the tomatoes, cucumber, and onion and toss well. Season to taste with additional salt and pepper. Let stand for 10 to 30 minutes before serving.
3. Sprinkle in the chopped basil and toss to combine. Garnish with the basil sprig. And serve.
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