Cook the pasta in boiling salted water for about 8 minutes. In the meantime defrost the peas. Peel onion and garlic and chop finely. Remove the shells of the scampi - except for the tail tips and intestines.
Heat the fat. Fry the garlic, onion and scampi for about 5 minutes, turning them over. Sprinkle with salt and pepper and lemon juice. Remove the scampi. Add cream, stock and peas to the frying fat and bring to the boil.
Season to taste with salt, pepper, saffron and lemon juice. Sprinkle in sauce thickener. Season again and add the scampi to the sauce. Serve pasta and sauce garnished with dill and lemon slice.