To serve, strain off any excess liquid, and form into a round on a plate. To do so, place a metal ring (like a large biscuit cutter) onto a plate and fill the ring with the tomato mixture. Press the mixture down firmly to shape, using a paper towel to blot any excess juices. If you have remaining tomatoes, repeat this step on a second plate.
Method
Combine the tomatoes, onions, capers, parsley, salt and pepper in a medium bowl and mix well.
Cover and keep refrigerated until ready to serve.
Drizzle with olive oil and balsamic vinegar, if desired, and serve.
