Cut the tomatoes into quarters. Using a small sharp knife, carefully remove and discard the core, pulp, and seeds. Cut the tomatoes into small dice and place in a small mixing bowl. Add the garlic, parsley, and oregano, tossing to blend. Drizzle with the olive oil and season with salt and pepper to taste. Set aside to marinate at room temperature for at least 1 hour before using.
To peel tomatoes, bring a pot of water to a boil. Core and lightly score the tomato skin in quarters. Place the scored tomato in the boiling water for 30 seconds. Immediately remove and place the tomato in ice water to chill. Remove from the ice water and, using a paring knife, carefully pull off the skin. Once peeled, the tomato can be used in any recipe calling for cored, peeled tomatoes.