Cook the pasta in boiling salted water (approx. 1 tablespoon salt) according to the instructions on the packet.
Peel onion and garlic. Chop the onion finely. Cut garlic into thin slices. Clean the chilli, cut lengthwise, remove seeds, wash and cut into fine rings. Heat oil in a pan.
Fry the onion, garlic and chilli in it.
Drain the tuna, pluck it. Remove 3-4 tablespoons of pasta water from the pot, drain the pasta. Add the pasta and pasta water to the pan. Stir in tuna and frozen herbs well, heat up briefly.
Season to taste with pepper and salt if necessary. Serve.