Cook the spaghetti according to the instructions on the packet.
In the meantime, wash and clean the spring onions and cut into fine rings.
Sauté the spring onions in butter. Add the cream, vegetable stock and lemon juice, simmer gently and reduce until creamy while stirring. Season with salt and pepper. At the very end, mix in the peeled small prawns and heat them up briefly, otherwise they will be tough.
Drain the spaghetti and mix with the sauce. Serve with basil leaves.