For the bruschetta mixture, wash the tomatoes, quarter them, remove the seeds and dice them finely. Peel and finely dice the onions and garlic. Wash and finely chop the basil. Mix tomatoes, basil, 1 tablespoon of oil, half onions and half garlic. Season to taste with salt and pepper.
For the noodles, cook spaghetti in boiling salted water according to package instructions. Heat 2 tablespoons of oil in a frying pan. Sauté the rest of the onions and garlic until translucent. Add tomato puree and sauté briefly. Add strained tomatoes. Bring to the boil and simmer for about 5 minutes. Season sauce with salt and pepper.
Rinse the fillets, dab dry. Season with salt and pepper and sprinkle with Italian herbs. Heat 1 tablespoon of oil in a frying pan. Fry the fillets for about 6 minutes on each side. Meanwhile drain the spaghetti and put it back into the pot. Add tomato sauce, mix everything. Arrange spaghetti and filets. Spread the bruschetta mixture over the fillets. Slice parmesan cheese over it. Drizzle with balsamic cream.