Stir in tomato paste and smoked paprika ... Add reserved merguez sausage. Season with salt as needed. Add 1½ cups water and pasta to the same pot. Bring to a simmer while stirring.
If the sauce appears a bit dry, add a splash of the starchy pasta water. Serve up the spicy sausage and creamy tomato sauce with fresh tagliatelle, topped off with the remaining grated Italian ...