Boil a large bowl. Add the pasta and some salt. And let it cook as indicated on the package.
Melt the butter on a medium heat in a pan and fry the salmon. Shake the pan occasionally so that the butter covers the salmon nicely everywhere. Add a first spoon of lemon zest and the cream.
Simmer together until the fish is ready. A few minutes will suffice. Meanwhile drain the pasta and keep warm. When the salmon is ready, put the pasta in a pan with the remaining lemon zest. You can now possibly finish with salmon eggs.