Meanwhile, heat a large frying pan over medium heat. Add the olive oil and heat for 1 minute. Add the onion and cook stirring for 2β4 minutes. Add the garlic and anchovies and cook, stirring for 3 minutes. Add the tomato paste, diced tomatoes, crushed tomatoes and oregano and gently simmer for about 8β10 minutes. Add the red chilli flakes (if using), capers and pitted olives, and stir through the sauce.
3 tablespoons extra virgin olive oil, 1 brown onion, 3 cloves garlic, 3 anchovy fillets, 1 tablespoon tomato paste, 2 roma tomatoes, 400 g canned crushed tomatoes, 1 tablespoon oregano, 1 teaspoon red chilli flakes, 2 tablespoons capers