You make this one-pot pasta with a no-cook sauce by gently warming the sauce ingredients in a heatproof bowl over the pasta water as it comes to a boil. Adapted from No Cook Pasta Sauces, by Joie Warner.
In a heatproof serving bowl large enough to fit over your pasta pot, break drained tuna into bite-size chunks. Add garlic, salt, pepper, lemon juice and zest, olive oil and capers; gently stir to combine.
In a large pot over medium-high heat, put water on to boil for pasta. Place heatproof bowl with tuna mixture over the pot (the bottom of the bowl should be above the water). Once the water reaches a boil, remove bowl and set aside. Add pasta to boiling water and cook according to package directions until al dente.
Drain pasta and add to sauce in bowl; gently toss to combine. Sprinkle parsley over and serve immediately.