Start by preheating a nonstick pan over medium heat.
Bring water to a boil in a large pot with some salt.
Fry the yellow onion and garlic for a few minutes, until softened and it starts to get golden brown.
If using salsiccia sauce cut the sausage open and divide into smaller pieces (mince like pieces)
Add the salsiccia mince to the pan and let it fry.
Add the pasta to the boiling water and boil until al dente.
Stir the salsiccia mince constantly and let it fry until golden brown. Add the rosemay, capers, lemon juice and lemon zest to the mince and stir to combine.
When the pasta is ready add about 1-2 tbsp of the pasta water to the salsiccia mince and drain the rest of the pasta.
Add the pasta to the pan and combine. Let it fry for another 1 minutes. Add sea salt and black pepper according to taste.
Serve on plates, top with percorino and chopped basil.