Peel the clove of garlic in some oil, add the sardines, well rinsed and boned, melt them stirring with care. Mix the tomato and a few spoons of water. Add the chunks of tuna and a bit of parsley.Cook the ingredients together for 10 minutes. In the meanwhile bring to the boil a pan with plenty of salted water, when it starts boiling again, toss the pasta. Drain it al dente and mix it with the sauce.