1. Peel the tomatoes, remove the seeds and cut the flesh into dices. Chop the onion and cook it in a saucepan with the oil until it becomes translucent. Cut the hake fillets into pieces. Add the tomatoes and hake to the onion.2. Cook over low heat for 10 to 15 minutes. Chop the basil leaves and add them to the mixture, along with salt and pepper, just before the end of cooking.3. Meanwhile, cook the pasta al dente in a large quantity of boiling salted water. Drain and mix with the sauce in the saucepan, stir for a few minutes, and serve hot.