Stir in the tuna and salt. Toss the pasta with the sauce, loosening with a little pasta water if necessary. Serve the tuna pasta sprinkled with the remaining parsley and freshly ground pepper.
Simmer, stirring occasionally, until juices thicken slightly, 15-20 minutes. Stir tuna, capers and lemon zest into the sauce. Add drained spaghetti and a generous drizzle of olive oil, and toss ...