Preparation Whisk together lemon juice, sugar, 1/2 teaspoon salt, and 1/8 teaspoon pepper in a large bowl until sugar and salt have dissolved. Add oil and whisk until combined well. Stir in tomatoes and onion and let stand 10 minutes. Add remaining ingredients and toss to coat.
Preparation Whisk together lemon juice, sugar, 1/2 teaspoon salt, and 1/8 teaspoon pepper in a large bowl until sugar and salt have dissolved. Add oil and whisk until combined well. Stir in tomatoes and onion and let stand 10 minutes. Add remaining ingredients and toss to coat.