Frittata Affogata with Capers Olives and Anchovies

Name: Frittata Affogata with Capers, Olives, and Anchovies
Ingredients: For the sauce:; 2 tablespoons extra-virgin olive oil; 1/2 yellow onion, finely chopped; 1/2 carrot, finely chopped; 1/2 stalk of celery, finely chopped; 400 grams tomatoes, fresh or canned, chopped (drain if canned); 2 tablespoons Italian parsley, chopped; 2 tablespoons capers, coarsely chopped; 4 anchovy fillets, coarsely chopped; 7 Kalamata olives, coarsely chopped; salt and freshly ground black pepper to taste; 1 pinch cayenne, or to taste; For the frittata:; 4 eggs; 1 tablespoon flour; salt and freshly ground pepper to taste