Cook the pasta according to the instructions on the packet.
Finely dice the onion and sauté in the butter in a saucepan. Dust the curry over it and stir in. Add the cream and reduce over medium heat. Add the shrimps or crabs (let the frozen products thaw beforehand) and cook briefly while stirring. Season to taste with salt.
Tear apart the coriander, chop the parsley and add to the sauce.