Defrost the fish at room temperature. Wash and halve the tomatoes. Peel and roughly dice the onion. Wash basil, shake dry, pluck leaves from the stalks and chop, except for a little to garnish. Cook the pasta in boiling salted water according to the instructions on the packet. Wash the fish, dab dry and season with salt and pepper. Drizzle with lemon juice and turn in flour.
Heat the fat in a pan and fry the fish for about 5 minutes while turning. Heat 1 tbsp. oil in a second pan and braise onion cubes and tomatoes for approx. 4 minutes while turning. Season to taste with salt, pepper and basil. Drain the pasta in a sieve. Arrange fish, tomatoes and noodles on a plate and garnish with basil
Waiting time approx. 1 hour