Preparation Whisk vinegar and oregano in medium bowl to blend. Gradually whisk in oil. Mix in green chilies and green onions. (Can be made 6 hours ahead. Cover; chill.) Add tomatoes; toss to coat. Season with salt and pepper.
Preparation Whisk vinegar and oregano in medium bowl to blend. Gradually whisk in oil. Mix in green chilies and green onions. (Can be made 6 hours ahead. Cover; chill.) Add tomatoes; toss to coat. Season with salt and pepper.