Prepare the ingredients: seed and dice 3 medium tomatoes; finely chop 1 small shallot; chop 3 tablespoons fresh basil and 2 tablespoons fresh parsley; if not already chopped, chop 1 1/2 teaspoons capers in vinegar.
In a bowl, add the diced tomatoes, chopped shallot, basil, parsley, and chopped capers.
Drizzle 2 1/2 tablespoons extra-virgin olive oil and 1 tablespoon fresh lemon juice over the mixture.
Season with a pinch of salt and a pinch of black pepper.
Gently mix with a spoon or spatula to combine, taking care not to crush the tomatoes.
Taste and, if desired, add more olive oil and/or adjust the salt and pepper to your preference.
Let the sauce sit at room temperature, undisturbed, for 1 hour to allow the flavors to meld, then stir gently and serve.