Cut tomato in half and rub with olive oil, salt and pepper. Place on a white-hot grill and grill for a couple of minutes or until tomato is charred. Allow to cool and removed skin. Dice cooled tomato and place in a medium bowl.
To prepare vinaigrette, whisk tomato with next 3 ingredients. Slowly add oil while whisking. Whisk in tomato, basil and capers. Season with salt and pepper.