Boil the pasta and heat the marinara sauce.
While that’s happening, heat a skillet with the olive oil. Saute the garlic until lightly golden. Add the anchovies and break up until dissolved. Roughly chop the capers and add them to the pan. Follow with the chili flakes.
Add the cooked pasta to the pan. Toss to coat thoroughly. Next, add the marinara one ladle at a time until all the pasta is thinly coated in sauce.
Empty 1-2 cans of tuna over the pasta, including the oil. Toss gently to distribute the tuna without breaking up the chunks too much.
Garnish with the fresh parsley and serve!
