Boil the Pasta: Bring a large pot of salted water to a boil. Add 12 ounces of pasta and cook according to the package instructions until al dente (8-10 minutes). Before draining, reserve 1 cup of the starchy pasta water. Drain the pasta, but do not rinse it.
Sauté the Garlic: Heat 1 tablespoon of extra virgin olive oil in a large skillet or saucepan over medium heat. Add 2 finely chopped garlic cloves and cook for 30 seconds, just until fragrant.
Add the Tuna: Add 10-12 ounces of canned tuna packed in olive oil (including the oil from the cans) to the skillet. Break up the tuna gently and sauté until heated through, about 1-2 minutes. Turn off the heat and set aside.
Combine Pesto and Pasta: In a large serving bowl, add 1-2 cups of pesto. Toss the cooked pasta into the bowl using tongs or a wooden spoon. Gradually drizzle in the reserved pasta water, a little at a time, to thin the pesto and coat the noodles evenly. Use only as much pasta water as needed to achieve a smooth consistency.
Mix in Tuna: Add the sautéed tuna to the pasta and pesto mixture. Toss gently until everything is combined.
Season and Serve: Taste and adjust seasoning with salt, as needed. For a little heat, sprinkle with red pepper flakes. Serve with freshly grated Parmesan cheese on top.
Notes
Use High-Quality Tuna: Splurging on a good can of tuna packed in olive oil will elevate this dish with extra flavor and moisture.
Save Your Pasta Water: The starchy pasta water helps create a silky sauce when combined with the pesto. Use just enough to thin out the sauce without making it watery.
Gluten-Free Option: This recipe works well with gluten-free pasta, making it a versatile option for different dietary needs.