In a frying pan, warm a bit of the oil from the sun-dried tomatoes. Add the finely chopped onion and fry on low heat until it turns golden brown.
Next, add the finely chopped fresh tomatoes. Continue to cook, stirring from time to time, until the majority of the tomato juice has reduced and a sauce forms.
In the meantime, boil the pasta in salted water, following the directions on the package.
Remove the excess oil from the dried tomatoes, chop them into smaller pieces, and set them aside.
To finish off the tomato sauce, add the dried tomatoes, oregano, and season with salt and black pepper to your liking.
Divide the freshly drained, hot pasta between two plates. Top with the rich tomato sauce, followed by the drained tuna, capers, and fresh basil leaves. For an extra touch, drizzle a bit of olive oil over everything. Enjoy!