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Bring a large pot of generously salted water to a boil and drop in the spaghetti.
Put a large sauté pan over a medium flame and heat the oil. Add the onion and red pepper to the pan and sauté for 2 minutes.
Add in the tomatoes and the salt and cook until the tomatoes just begin to break down. About 3-5 minutes.
Add the tuna and capers to the pan and cook for 2-3 minutes. By now the pasta should be just at al dente.
Add the spaghetti and parsley to the pan and toss for 1-2 minutes. Taste for seasoning and add more salt and black pepper as desired.