Cook the spaghetti in boiling salted water for about 11 minutes. In the meantime, wash the prawns and pat them dry. Wash squid tubes and cut into rings. Peel and finely chop the onions. Clean, wash and halve the tomatoes. Heat oil in a pan.
Fry the onions, prawns and squid rings for about 5 minutes while turning. Season with salt, pepper and lemon juice and deglaze with white wine, stock and cream. Add bay leaves and bring to the boil. Stir in mustard, add tomatoes, simmer for 5 minutes. Add sauce thickener, season again. Serve spaghetti and sauce garnished with dill and lemon