Start by boiling water in a large pot. Add salt to the boiling water and cook the spaghetti according to the package instructions until it reaches the desired doneness. Drain the spaghetti and set it aside.
300 g spaghetti
Heat a large skillet or frying pan over medium heat. Add the canned tuna (including the oil) to the pan and break it up into smaller chunks using a spatula or fork. Sauté the tuna for about 2-3 minutes until it's slightly browned.
2 x 80g canned tuna in oil
Add the sliced garlic, capers, and diced chili pepper (if using) to the pan. Sauté everything together for another 2 minutes, stirring occasionally.
3 garlic cloves, 1 heaped spoon capers, 1 chili pepper
Cut the cherry tomatoes in half and add them to the pan. Cook for about 3-4 minutes until the tomatoes start to soften and release their juices.
150 g cherry tomatoes
Stir in the tomato paste and mix well to combine it with the other ingredients. Cook for an additional 2 minutes to allow the flavors to meld together.
50 g tomato paste
Tear a few fresh basil leaves into smaller pieces and add them to the pan. Season with salt and pepper to taste. Stir everything together and cook for another minute.
Fresh basil, Salt and pepper to taste
Add the drained spaghetti to the pan with the tuna mixture. Toss everything together gently, ensuring that the spaghetti is coated evenly with the sauce.
Sprinkle the grated Parmesan cheese over the spaghetti and toss it once again to incorporate the cheese.
100 g grated Parmesan cheese
Serve the tuna spaghetti immediately, garnished with a few fresh basil leaves and an extra sprinkle of Parmesan cheese, if desired.